Illinois library barcode prefixes
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For a directory of academic libraries in Illinois see: Consortium of Academic and Research Libraries in Illinois (CARLI).
For more information about these libraries (contact information, lending policies, etc.), see the Library Learning (L2) resource sharing lookup site.
| Prefix | Library | Agency Code | Library System |
|---|---|---|---|
| 1804 | Acorn Library District | ADS | RAILS |
| 7543 | Adams Elementary School (Decatur) | ILHS | |
| 1338 | Addison Public Library | ADD | RAILS |
| 2460 | Advocate Health Sciences Library | LGK | RAILS |
| 4440 | Advocate Library Network | XHS | RAILS |
| 1488 | Algonquin Area Public Library District | ALK | RAILS |
| 0111 | Alleman High School | ALLG | RAILS |
| 1215 | Allerton Public Library (Monticello) | MON | IHLS |
| 1145 | Alsip-Merrionette Park Public Library District | AMS | RAILS |
| 8601 | Amboy C.U.S.D. #272 Libraries | AMLY | RAILS |
| 0104 | Andalusia Township Library | ANDG | RAILS |
| 7001 | Anderson/Oglesby (Markham) | MKS | RAILS |
| 0102 | Annawan School | ASDG | RAILS |
| 0203 | Annawan-Alba Township Library | AAPG | RAILS |
| 5926 | Antioch Public Library | HRQ | RAILS |
| 3722 | Aptakisic-Tripp CCSD 102 | BQQ | RAILS |
| 7520 | Argenta/Oreana High School | IHLS | |
| 1803 | Argenta/Oreana Public Library | IHLS | |
| 1184 | Arlington Heights Memorial Library | AHK | RAILS |
| 7542 | Assumption Public Library | IHLS | |
| 7594 | Athens Public Lib | IHLS | |
| 2770 | Atwood Public Library | ATR | IHLS |
| 0059 | Augustana College | AUG | RAILS |
| 1750 | Aurora Public Library | AOD | RAILS |
| 1811 | Barclay Public Library (Warrensburg) | WAR | IHLS |
| 1487 | Barrington Public Library District | BAK | RAILS |
| 9800 | Bartlett Public Library District | BTD | RAILS |
| 6173 | Batavia Public Library District | BLD | RAILS |
| 7566 | Baum Elementary School (Decatur) | IHLS | |
| 1381 | Bedford Park Library District | BPS | RAILS |
| 0304 | Beecher Public Library | BCS | RAILS |
| 0007 | Belleville Public Library | BDA | IHLS |
| 1731 | Bellwood Public Library | BWS | RAILS |
| 8604 | Belvidere S.D. #100 Librarie | BNHY | RAILS |
| 1437 | Bensenville Community Public Library District | BND | RAILS |
| 1993 | Berkeley Public Library | BKS | RAILS |
| 2742 | Bertolet Memorial Library District | BMLY | RAILS |
| 2957 | Berwyn Public Library | BYS | RAILS |
| 0031 | Bethalto Public Library | BTA | IHLS |
| 7532 | Bethany High School | IHLS | |
| 0060 | Bettendorf (Iowa) Public Library | BPL | RAILS |
| 5563 | Big Rock Library | RAILS | |
| 0061 | Black Hawk College Library | BHCG | RAILS |
| 0051 | Blackburn College | ABA | IHLS |
| 3680 | Blandinsville-Hire Public Library District | BLH | RAILS |
| 0051 | Bloomingdale Public Library | BDD | RAILS |
| 1190 | Bloomington Public Library | BLR | RAILS |
| 1237 | Blue Island Public Library | BIS | RAILS |
| 1816 | Blue Mound Memorial Public Library | BMR | IHLS |
| 2918 | Bond Elementary School (Assumption) | IHLS | |
| 1555 | Bourbonnais Public Library District | BDBB | RAILS |
| 8641 | Boylan Central Catholic High School Library | BCCY | RAILS |
| 6800 | Bradley Public Library District | BRBB | RAILS |
| 0029 | Breese Public Library | BRA | IHLS |
| 7567 | Brush College Elementary School (Decatur) | ILHS | |
| 2081 | Bridgeview Public Library | BVS | RAILS |
| 3369 | Brimson Grow Library, Northern Baptist Theological Seminary | BGL | RAILS |
| 1314 | Broadview Public Library | BRS | RAILS |
| 0056 | Brookfield Free Public Library | BFS | RAILS |
| 8663 | Bureau Valley C.U.S.D. #340 | BVHG | RAILS |
| 5927 | Byron C.U.S.D. #226 School | BRLY | RAILS |
| 1523 | Byron Public Library District | BYLY | RAILS |
| 0021 | Cahokia High School | GBA | IHLS |
| 0081 | Cahokia Public Library | CAA | IHLS |
| 1613 | Calumet City Public Library | CCS | RAILS |
| 2325 | Calumet Park Public Library | CAS | RAILS |
| 3034 | Camargo Township Library (Villa Grove) | VGN | IHLS |
| 0014 | Carlinville Public Library | BHA | IHLS |
| 0054 | Carlyle High School | GIA | IHLS |
| 7593 | Carnegie-Schuyler Public Lib (Pana) | IHLS | |
| 1319 | Carol Stream Public Library | CSD | RAILS |
| 6116 | Cary Area Library | CPQ | RAILS |
| 0019 | Case Halstead Public Library (Carlyle) | BLA | RAILS |
| 0082 | Caseyville Public Library | CBA | IHLS |
| 0046 | Central Community High School District (Breese) | GFA | IHLS |
| 2918 | Central A&M High School (Moweaqua) | IHLS | |
| 2918 | Central A&M Middle School (Assumption) | IHLS | |
| 1002 | Central High School (Burlington) | BUD | RAILS |
| 0028 | Centreville Library | BQA | IHLS |
| 8504 | Chadwick Public Library District | CDLY | RAILS |
| 8627 | Chadwick-Milledgeville #399 | MWLY | RAILS |
| 1305 | Champaign Public Library | CHN | IHLS |
| 3035 | Chanute Air Force Base Library | QCN | IHLS |
| 1924 | Charles B. Phillips Public Library (Newark) | CPBB | RAILS |
| 1235 | Charleston Carnegie Public Library | CRN | IHLS |
| 6082 | Chatham Public Library | IHLS | |
| 1533 | Cherry Valley District Library | CVL | RAILS |
| 1539 | Chicago Heights Free Public Library | CHS | RAILS |
| 1011 | Chicago Ridge Public Library | CRS | RAILS |
| 1942 | Cicero Public Library | CIS | RAILS |
| 1737 | Clarendon Hills Public Library | CNS | RAILS |
| 0062 | Clinton (Iowa) Community College Library | CCC | RAILS |
| 8542 | Clinton Township Public Library (Waterman) | CTPY | RAILS |
| 5920 | Coal City Public Library | CCBB | RAILS |
| 1304 | College of DuPage | COD | RAILS |
| 0084 | Colona District Library | CLNG | RAILS |
| 0095 | Colona School District | CSDG | RAILS |
| 0026 | Columbia Public Library | BOA | IHLS |
| 5556 | Cook County Law Library | CCC | RAILS |
| 1377 | ?? | ?? | ?? |
| 1122 | Cook Memorial Public Library District (Libertyville) | LIK | RAILS |
| 0091 | Cordova District Library | CORG | RAILS |
| 8544 | Cortland Public Library District | COLY | RAILS |
| 2525 | Cove School (Northbrook) | CNK | RAILS |
| 7577 | Cowden-Herrick High School | IHLS | |
| 8545 | Creston-Dement Public Library | CRDY | RAILS |
| 7651 | Crestwood | CWS | RAILS |
| 1886 | Crete Public Library District | CTS | RAILS |
| 2306 | Crystal Lake Public Library | CLK | RAILS |
| 8606 | Dakota C.U.S.D. #201 Libraries | DALY | RAILS |
| 3030 | Danville Community College | ZDN | RAILS |
| 1205 | Danville Public Library | DAN | IHLS |
| 0023 | Daugherty Public Library District (Dupo) | BMA | IHLS |
| 0063 | Davenport (Iowa) Public Library | DPL | RAILS |
| 7591 | Decatur Memorial Hospital | IHLS | |
| 1202 | Decatur Public Library | DPR | IHLS |
| 0064 | Deere & Co. Library | DCL | RAILS |
| 9094 | Deerfield Public Library | DFK | RAILS |
| 8607 | DeKalb C.U.S.D. #428 Libraries | DHSY | RAILS |
| 2065 | DeKalb Public Library | DKLY | RAILS |
| 1601 | Delos F. Diggins Public Library (Harvard) | HRL | RAILS |
| 7551 | Dennis Elementary School (Decatur) | IHLS | |
| 1468 | Des Plaines Public Library | DPK | RAILS |
| 1557 | Des Plaines Valley Public Library District (Crest Hill Branch) | CHB | RAILS |
| 1556 | Des Plaines Valley Public Library District (Lockport Branch) | LKB | RAILS |
| 8645 | Dillon Elementary | ||
| 7538 | Divernon Public Library | IHLS | |
| 8608 | Dixon C.U.S.D. #170 Libraries | DILY | RAILS |
| 1515 | Dixon Public Library | DXLY | RAILS |
| 1146 | Dolton Public Library District | DOS | RAILS |
| 3039 | Douglas Township Library (Gilman) | GIN | IHLS |
| 1191 | Downers Grove Public Library | DGS | RAILS |
| 7577 | Dry Point Public Lib (Cowden) | IHLS | |
| 8609 | Durand C.U.S.D. #322 Libraries | DSLY | RAILS |
| 7571 | Durfee Elementary School (Decatur) | IHLS | |
| 1336 | DUPAGE LIBRARY SYSTEM | DPD | RAILS |
| 1337 | DUPAGE LIBRARY SYSTEM | DPD | RAILS |
| 6051 | Earlville Public Library District | EAPY | RAILS |
| 0005 | East Alton Public Library | BBA | IHLS |
| 8505 | East Dubuque District Library | EDLY | RAILS |
| 8610 | East Dubuque Unit S.D. #119 | EDHY | RAILS |
| 0086 | East Moline Correctional Center | PRI | RAILS |
| 0065 | East Moline Public Library | EMPG | RAILS |
| 0049 | East St. Louis High School | GGA | IHLS |
| 0009 | East St. Louis Public Library | BFA | IHLS |
| 3939 | Edward Hospital | EHD | RAILS |
| 0008 | Edwardsville Public Library | BEA | IHLS |
| 7534 | Eisenhower High Sch (Decatur) | IHLS | |
| 1134 | Eisenhower Public Library (Harwood Heights & Norridge) | ESS | RAILS |
| 1241 | Ela Area Public Library District (Lake Zurich) | EAK | RAILS |
| 3841 | Elgin Community Unit School District U46 | UFK | RAILS |
| 1817 | Elizabeth Titus Memorial Library (Sullivan) | SUR | IHLS |
| 0243 | Elizabeth Township Public Library | ELLY | RAILS |
| 1250 | Elk Grove Village Public Library | ELK | RAILS |
| 8514 | Ella Johnson Memorial Public Library (Hampshire) | EJMY (HAL) | RAILS |
| 1135 | Elmhurst Public Library | EHS | RAILS |
| 1208 | Elmwood Park Library District | EPS | RAILS |
| 7565 | Enterprise Elementary School (Decatur) | IHLS | |
| 2707 | Erie Public Library | ERIG | RAILS |
| 1192 | Evanston Public Library | EVK | RAILS |
| 2778 | Evergreen Park Public Library | EVS | RAILS |
| 0015 | Fairview Heights Public Library | BIA | IHLS |
| 7612 | Findlay High School | IHLS | |
| 8533 | Flagg-Rochelle Public Library District | FRPY | RAILS |
| 1249 | Flossmoor Public Library | FMS | RAILS |
| 2026 | Forest Park Public Library | FPS | RAILS |
| 0606 | Forreston Public Library | RAILS | |
| 1749 | Forsyth Public Library | FOR | IHLS |
| 2186 | Fossil Ridge Public Library District (Braidwood) | FRBB | RAILS |
| 2186 | Fossil Ridge Public Library District(Bookmobile) | FBBB | RAILS |
| 3805 | Fox Lake Public Library | FLK | RAILS |
| 2274 | Fox River Grove Public Library | FRQ | RAILS |
| 1783 | Fox River Valley Public Library District (Dundee) | DUK | RAILS |
| 0094 | Franciscan University | MSC | RAILS |
| 1203 | Frankfort Public Library District | FRS | RAILS |
| 8602 | Franklin Center High School #271 | ACIY | RAILS |
| 7563 | Franklin Elementary School (Decatur) | IHLS | |
| 1316 | Franklin Park Public Library District | FPD | RAILS |
| 8509 | Franklin Grove Public Library | FGLY | RAILS |
| 8510 | Freeport Public Library | FPLY | RAILS |
| 7641 | Freeport S.D. #145 Libraries | FSLY | RAILS |
| 3090 | Fremont Public Library District (Mundelein) | MUK | RAILS |
| 7585 | French Academy (Decatur) | IHLS | |
| 1803 | Friends Creek Public Library (Argenta) | FCR | IHLS |
| 0401 | Fountaindale Public Library District (Bolingbrook) | BBB | RAILS |
| 0404 | Fountaindale Public Library District (Bookmobile) | BBB | RAILS |
| 0106 | Fulton Elementary School | FESG | RAILS |
| 0108 | Fulton High School | FHSG | RAILS |
| 1113 | Gail Borden Public Library | ELG | RAILS |
| 8512 | Galena Public Library District | GALY | RAILS |
| 8615 | Galena Unit S.D. #120 LRC | GLLY | RAILS |
| 7569 | Garfield Elementary School (Decatur) | IHLS | |
| 0090 | Geneseo District Public Library | GPLG | RAILS |
| 0120 | Geneseo School District | GHSG | RAILS |
| 0205 | Genesis Medical Center | ILI | RAILS |
| 0052 | Geneva Public Library District | GVD | RAILS |
| 8513 | Genoa Public Library District | GELY | RAILS |
| 8616 | Genoa-Kingston C.U.S.D. #424 | GKLY | RAILS |
| 1225 | Georgetown Public Library | GEN | IHLS |
| 0052 | Germantown Public Library District | B8K | IHLS |
| 0047 | Gillespie Public Library | BKA | IHLS |
| 0042 | Glen Carbon Centennial Library | B4K | IHLS |
| 1322 | Glen Ellyn Public Library | GED | RAILS |
| 1121 | Glencoe Public Library | GCK | RAILS |
| 1385 | Glenside Public Library District | GHD | RAILS |
| 1170 | Glenview Public Library | GVK | RAILS |
| 6088 | Glenwood-Lynwood Public Library District | GWS | RAILS |
| 0002 | Gompers Junior High School (Joliet) (Inactive) | JGB | RAILS |
| 0036 | Grand Prairie of the West Public Library District (Virden) | BZA | IHLS |
| 1402 | Grande Prairie Public Library (Hazel Crest & Country Club Hills) | GPS | RAILS |
| 0940 | Grant Park Public Library | RAILS | |
| 0517 | Graves-Hume Public Library District (Mendota) | GVHY | RAILS |
| 6109 | Grayslake Public Library | GRK | RAILS |
| 0202 | Great River Medical Center | GRM | RAILS |
| 1814 | Green Hills Public Library District | GHS | RAILS |
| 7560 | Greenview High School | IHLS | |
| 0032 | Greenville Public Library | BUA | IHLS |
| 2770 | Hammond Public Library | HMR | IHLS |
| 0098 | Hampton Elementary School District | HAMG | RAILS |
| 2125 8515 |
Hanover Township Library | HNLY | RAILS |
| 7555 | Hanson Engineering (Springfield) | IHLS | |
| 0034 | Hartford Public Library | BWA | IHLS |
| 7570 | Harris Elementary School (Decatur) | IHLS | |
| 8617 | Harvard C.U.S.D. #50 Libraries | HSLY | RAILS |
| 1136 | Harvey Public Library | HAS | RAILS |
| 0030 | Hayner Public Library District (Alton) | BSA | IHLS |
| 1502 | Helen M. Plum Memorial Library (Lombard) | LOD | RAILS |
| 1806 | Helen Matthes Library (Effingham) | EFR | IHLS |
| 0092 | Henry C. Adams Memorial Library (Prophetstown) | PTN | RAILS |
| 1979 | HERITAGE TRAIL LIBRARY SYSTEM (now Prairie Area Library System) | PALS | RAILS |
| 7581 | Herrick Grade School | IHLS | |
| 7581 | Herrick Township Public Library | IHLS | |
| 8619 | Hiawatha C.U.S.D. #426 Libraries | HHSY | RAILS |
| 8511 | Highland Community College Library | HCCY | RAILS |
| 8658 | Highland Elementary (Meridian Schools) | SP4Y | RAILS |
| 1000 | Highland Park Public Library | HPK | RAILS |
| [none] | Highwood Public Library | HIK | RAILS |
| 1992 | Hillside Public Library | HSS | RAILS |
| 8618 | Hinckley-Big Rock High School #429 | HBLY | RAILS |
| 8516 | Hinkley Public Library District | HLKY | RAILS |
| 1279 | Hinsdale Public Library | HDS | RAILS |
| 1301 | Hindu Temple of Greater Chicago | ||
| 5930 | Hodgkins | HKS | RAILS |
| 2889 | Homer Township Public Library District | HDBB | RAILS |
| 2889 | Homer Township Public Library District Bookmobile | HBBB | RAILS |
| 1311 | Homewood Public Library | HWS | RAILS |
| 1742 | Homewood-Flossmoor High School | HFS | RAILS |
| 8651 | Hononegah Community High School District #207 Library | HCHY | RAILS |
| 6083 | Hope Welty Public Library (Cerro Gordo) | IHLS | |
| 6839 | Huntley Area Public Library District | HUK | RAILS |
| 8503 | Ida Public Library (Belvidere) | BVL | RAILS |
| 7596 | IL Department of Children & Family Services | IHLS | |
| 7576 | IL Department of Transportation (Springfield) | IHLS | |
| 7483 | IL Early Childhood (Springfield) | IHLS | |
| 7605 | IL Environmental Protection Agency (Springfield) | IHLS | |
| 1165 | IL Library materials | ISL | IHLS |
| 7540 | IL State Historical Library (Springfield) | IHLS | |
| 1129 | IL State Library | ISL | IHLS |
| 7587 | IL State Museum (Springfield) | IHLS | |
| 7583 | IL Supreme Court (Springfield) | IHLS | |
| 7578 | Illini Central High School (Mason City) | IHLS | |
| 2156 | Illiopolis Public Library | ILR | IHLS |
| 1015 | Illinois Veterans Home (Lasalle) | ILBB | RAILS |
| 2979 | Illinois Veterans Home (Manteno) | IHBB | RAILS |
| 8655 | ICLY | RAILS | |
| 1476 | Indian Prairie (formerly Darien) | INS | RAILS |
| 1525 | Indian Prairie (formerly Willowbrook) | INS | RAILS |
| 1946 | Indian Prairie Public Library District (Willowbrook & Darien) | INS | RAILS |
| 1125 | Indian Trails Public Library District (Wheeling) | WGK | RAILS |
| 1317 | Itasca Community Library (shares a prefix with Rantoul Public Library) | ITD | RAILS |
| 1747 | IVC Center – Rolling Prairie | IHLS | |
| 0057 | Jerseyville High School | GKA | IHLS |
| 0033 | Jerseyville Public Library | BVA | IHLS |
| 7547 | Johns Hill Magnet Sch (Decatur) | IHLS | |
| 6164 | Johnsburg Public Library District | JOLY | RAILS |
| 8625 | Johnsonburg C.U.S.D. #12 Libraries | JSLY | RAILS |
| 7695 | Joliet Catholic Academy | XFB | RAILS |
| 1967 | Joliet Public Library | JPB | RAILS |
| 7519 | Joliet Township High School District #204 (Central Campus) | JCHB | RAILS |
| 0019 | Joliet Township High School District #204 (West Campus) | JWHB | RAILS |
| 8537 | Julia Hull Public Library District | JHLY | RAILS |
| 2784 | Justice Public Library | JDS | RAILS |
| 1558 | Kankakee Public Library | KKBB | RAILS |
| 0093 | Kaplan College | AIC | RAILS |
| 8642 | Keith Country Day School Library | KCDY | RAILS |
| 0054 | Kenilworth Public Library District | KNK | RAILS |
| 8672 | Kings C.C.S.D. #144 | KNLY | RAILS |
| 8517 | Kirkland Public Library | KILY | RAILS |
| 7943 | Kishwaukee College Learning Resources Center | KIS KCLY |
RAILS |
| 4276 | Ladd Public Library | LDBB | RAILS |
| 6086 | La Grange Park Public Library District | LPS | RAILS |
| 1320 | LaGrange Public Library | LGS | RAILS |
| 7686 | Lake Bluff Public Library | LBK | RAILS |
| 1243 | Lake Forest Library | LFK | RAILS |
| 1981 | Lake Villa District Library | LVK | RAILS |
| 1220 | Lakeland Community College LRC | ZLN | IHLS |
| 0117 | LaMoille-Clarion Public Library District | LACG | RAILS |
| 8518 | Lanark Public Library | LNLY | RAILS |
| 2077 | LaSalle Public Library | LSBB | RAILS |
| 0100 | LeClaire Community Library | RAILS | |
| 1559 | Lemont Public Library District | LMB | RAILS |
| 8546 | Lena Community District Library | LELY | RAILS |
| 0001 | LEWIS & CLARK LIBRARY SYSTEM | IHLS | |
| 1137 | Lewis O. Flom Public Library (Lansing) | LSS | RAILS |
| 9846 | Limestone Public Library District | LIBB | RAILS |
| 7611 | Lincoln College (Lincoln) | IHLS | |
| 7610 | Lincoln Elementary School District (Lincoln) | IHLS | |
| 7535 | Lincoln High School | IHLS | |
| 7609 | Lincoln Junior High School (Lincoln) | IHLS | |
| 1247 | Lincoln Library (Springfield) | LLR | IHLS |
| 1807 | Lincoln Public Library | LIR | IHLS |
| 1227 | LINCOLN TRAILS LIBRARY SYSTEM | LTN | IHLS |
| 1242 | Lincolnwood Public Library District | LNK | RAILS |
| 7303 | Lisle Library District (materials) | LDS | RAILS |
| 7301 | Lisle Library District (patrons) | LDS | RAILS |
| 0006 | Louis Latzer Memorial Public Library (Highland) | BCA | IHLS |
| 7552 | Lovington High School | IHLS | |
| 1812 | Lovington Township Library | LOR | IHLS |
| 3002 | Loyola Academy | LOK | RAILS |
| 1722 | LTA Program (College of DuPage) | RAILS | |
| 1529 | Lyons Public Library | LYS | RAILS |
| 7498 | MacArthur High School (Decatur) | IHLS | |
| 7525 | Macon Public Library | IHLS | |
| 0056 | Madison High School | GJC | IHLS |
| 0039 | Madison Public Library | B2A | IHLS |
| 3031 | Mahomet Township Public Library | MAN | IHLS |
| 7564 | Main Street Elem Sch (Shelbyville) | IHLS | |
| 8522 | Malta Township Public Library | MLLY | RAILS |
| 8001 | Manhattan Public Library District | MTBB | RAILS |
| 3702 | Manteno C.U.S.D. | MHSB | RAILS |
| 6990 | Manteno Public Library District | MNBB | RAILS |
| 8523 | Maple Park Public Library District | MPLY | RAILS |
| 8623 | Marengo Community High School District #154 Media Center | MGLY | RAILS |
| 8524 | Marengo Public Library District | MRLY | RAILS |
| 8662 | Marian Central Catholic High School Library | MCCY | RAILS |
| 7539 | Maroa Public Library | IHLS | |
| 7561 | Maroa-Forsyth High School | IHLS | |
| 1804 | Marrowbone Township Library (Bethany) | MBR | IHLS |
| 3045 | Marshall High School | YMN | IHLS |
| 3040 | Marshall Public Library | MLN | IHLS |
| 6085 | Mason City Public Library | IHLS | |
| 0045 | Mater Dei High School (Breese) | GEA | IHLS |
| 1486 | Matteson Public Library | MTS | RAILS |
| 1312 | Maywood Public Library | MWS | RAILS |
| 0033 | Mazon-Verona-Kinsman Elementary School (Mazon) | MVEB | RAILS |
| 0033 | Mazon-Verona-Kinsman Middle School (Mazon) | MVMB | RAILS |
| 0428 | McClure Junior High School | MJS | RAILS |
| 2147 | McConathy Library District (Sauk Village) | SVS | RAILS |
| 1615 | McCook Public Library District | MCS | RAILS |
| 9900 | McHenry-Nunda Library District | MTK | RAILS |
| 2360 | McHenry Public Library District | MJK | RAILS |
| 2904 | Melrose Park Public Library | MPS | RAILS |
| 7606 | Memorial Medical Center (Springfield) | IHLS | |
| 3041 | Mercy Hospital (Urbana) | XMN | IHLS |
| 8658 | Meridian Junior High School (Stillman Valley) | SPLY | RAILS |
| 8646 | Merrill Elementary | ||
| 6878 | Messenger Public Library (North Aurora) | NAD | RAILS |
| 0018 | Metro East Lutheran High School (Edwardsville) | GAA | IHLS |
| 1614 | Midlothian Public Library | MDS | RAILS |
| 8502 | Mills & Petrie Memorial Library | MPMY | RAILS |
| 0110 | Mineral Gold Public Library | MGPG | RAILS |
| 0035 | Mississippi Valley Public Library District | BXA | IHLS |
| 1985 | Mokena Community Public Library District | MKBB | RAILS |
| 0067 | Moline Public Library | MPP | RAILS |
| 8658 | Monroe Center Elementary School (Meridian Schools) | SP3Y | RAILS |
| 2222 | Montini High School | MOD | RAILS |
| 0118 | Moore Memorial Library District | MMLG | RAILS |
| 9957 | Morris Area Public Library District | MRBB | RAILS |
| 0024 | Morrison Talbott Library (Waterloo) | BNA | IHLS |
| 8070 | Morton Arboretum | MAS | RAILS |
| 1245 | Morton Grove Public Library | MGK | RAILS |
| 7550 | Mound Middle School (Decatur) | IHLS | |
| 8526 | Mount Carroll Township Public Library | MCLY | RAILS |
| 8527 | Mount Morris Public Library | MMLY | RAILS |
| 1174 | Mount Prospect Public Library | MPK | RAILS |
| 7557 | Moweaqua Public Library | IHLS | |
| 3038 | Moyer Library (Gibson City) | GCN | IHLS |
| 7604 | Mt. Pulaski Elementary School | IHLS | |
| 1815 | Mt. Pulaski Public Library District | MPR | IHLS |
| 7515 | Mt. Zion High School | IHLS | |
| 7536 | Mt. Zion Intermediate School | IHLS | |
| 7537 | Mt. Zion Junior High Sch | IHLS | |
| 1808 | Mt. Zion Township Library | MZR | IHLS |
| 7568 | Muffley Elementary School (Decatur) | IHLS | |
| 0068 | Muscatine Community College | MCC | RAILS |
| 1541 | Museum of Science and Industry | MSC | RAILS |
| 0088 | Musser (Iowa) Public Library | MUS | RAILS |
| 1111 | Naperville School District #203 | NSD | RAILS |
| 3284 | National-Louis University | NEK | RAILS |
| 7607 | Neoga High School | IHLS | |
| 1984 | New Lenox Township Library | NLBB | RAILS |
| 0501 | Newman Central Catholic High School | NCLY | RAILS |
| 1318 | Nichols Library (Naperville) | NID | RAILS |
| 1491 | Niles Public Library District | NIK | RAILS |
| 6117 | Nippersink Public Library (Richmond) | NPLY (RIL) | RAILS |
| 8636 | Nippersink School District #2 Libraries | NMSY | RAILS |
| 8635 | North Boone C.U.S.D. #200 | NBHY | RAILS |
| 8507 | North Chicago Public Library | NCK | RAILS |
| 1943 | North Riverside Public Library District | NRS | RAILS |
| 1521 | North Suburban District Library | LPL | RAILS |
| 1286 | NORTH SUBURBAN LIBRARY SYSTEM | KKK | RAILS |
| 1123 | Northbrook Public Library | NBK | RAILS |
| 1258 | NORTHERN ILLINOIS LIBRARY SYSTEM (now Prairie Area Library System) | PALS | RAILS |
| 1138 | Northlake Public Library District | NLS | RAILS |
| 5560 | Northwestern University | NUK | RAILS |
| 1520 | NSLS Delinquent Patrons | NSK | RAILS |
| 1501 | NSLS Interlibrary Loan | NSK | RAILS |
| 0058 | O'Fallon CSD #90 | OCA | IHLS |
| 0016 | O'Fallon Public Library | BJA | IHLS |
| 0022 | O'Fallon Township High School | GCA | IHLS |
| 1534 | Oak Brook Free Public Library | OBD | RAILS |
| 7575 | Oak Grove Elementary School (Decatur) | IHLS | |
| 1186 | Oak Lawn Public Library | OLS | RAILS |
| 1132 | Oak Park Public Library | OPS | RAILS |
| 1497 | Oak Park-River Forest High School | OAS | RAILS |
| 1763 | Oakwood Township Public Library | OKN | IHLS |
| 0201 | Odell Public Library (Morrison) | MORG | RAILS |
| 7518 | Oglesby Public Library District | OGBB | RAILS |
| 8630 | Orangeville C.U.S.D. #203 | OVLY | RAILS |
| 7531 | Oreana Grade School | IHLS | |
| 8631 | Oregon C.U.S.D. #220 | OSLY | RAILS |
| 8528 | Oregon Public Library | ORLY | RAILS |
| 1315 | Orland Park Public Library | ORS | RAILS |
| 1335 | Oswego Public Library District | OSB | RAILS |
| 1265 | Palatine Public Library District | PAK | RAILS |
| 1950 | Packer Engineering - Knowledge Services | RAILS | |
| 1965 | Palos Heights Public Library | PHS | RAILS |
| 6089 | Palos Park Public Library District | PPS | RAILS |
| 8501 | Pankhurst Memorial Library | PMLY | RAILS |
| 1139 | Park Forest Public Library | PFS | RAILS |
| 1467 | Park Ridge Public Library | PRK | RAILS |
| 3036 | Parkland Community College | ZPN | IHLS |
| 7573 | Parsons Elementary School (Decatur) | IHLS | |
| 6135 | Paw Paw Public Library District | PWB | RAILS |
| 8632 | Pearl City C.U.S.D. #200 Libraries | PCLY | RAILS |
| 8529 | Pearl City Public Library District | PCLY | RAILS |
| 8633 | Pecatonica C.U.S.D. #321 Libraries | PALY | RAILS |
| 8530 | Pecatonica Public Library | PTLY | RAILS |
| 2890 | Peotone Public Library District | PEBB | RAILS |
| 2078 | Peru Public Library | PUGG | RAILS |
| 7523 | Petersburg Public Library | IHLS | |
| 3037 | Philo Township Public Library | PHN | IHLS |
| 1907 | Plainfield Public Library District | PLB | RAILS |
| 2891 | Plano Community Library District | PDBB | RAILS |
| 0378 | Plano C.U.S.D. #88 - Centennial School | PCEB | RAILS |
| 0378 | Plano C.U.S.D. #88 - Emily G. Johns School | PEJB | RAILS |
| 0378 | Plano C.U.S.D. #88 - High School | PHSB | RAILS |
| 0378 | Plano C.U.S.D. #88 - Middle School | PMSB | RAILS |
| 0378 | Plano C.U.S.D. #88 - P.H. Miller School | PHMB | RAILS |
| 8634 | Polo C.U.S.D. #222 Libraries | PSLY | RAILS |
| 8531 | Polo Public Library District | POLY | RAILS |
| 1339 | Poplar Creek Library District | SMD | RAILS |
| 7580 | Porta Grade School (Petersburg) | IHLS | |
| 7556 | Porta Junior-Senior High School (Petersburg) | IHLS | |
| 2783 | Prairie State College | PCS | RAILS |
| 0083 | Prairie Trails Public Library District | PTS | RAILS |
| 7358 | Princeton Public Library (formerly known as Matson Public Library) | PRGG | RAILS |
| 0306 | Princeton Township High School District #500 | PTWG | RAILS |
| 0115 | Prophetstown High School | PHSG | RAILS |
| 1530 | Prospect Heights Public Library District | PHK | RAILS |
| 9843 | Provena St. Joseph Medical Center | SJB | RAILS |
| 6297 | Providence Catholic High School (New Lenox) | XIB | RAILS |
| 3942 | Putnam County High School | PCHG | RAILS |
| 3942 | Putnam County Junior High School | PCJG | RAILS |
| 2079 | Putnam County Public Library District - Condit | PTGG | RAILS |
| 2079 | Putnam County Public Library District - Granville | GRGG | RAILS |
| 2079 | Putnam County Public Library District - Hennepin (Headquarters) | PCGG | RAILS |
| 2079 | Putnam County Public Library District - Magnolia | MGGG | RAILS |
| 2079 | Putnam County Public Library District - McNabb | MCGG | RAILS |
| 2079 | Putnam County Public Library District - Standard | SDGG | RAILS |
| 3441 | Quincy Public Library | RAILS | |
| 1140 | RAILS (formerly Metropolitan/Suburban Library System) | SLS | RAILS |
| 0050 | RAILS - Coal Valley Service Center (formerly River Bend Library System, then Prairie Area Library System) | CVSG | RAILS |
| 1258 | RAILS - Rockford Service Center (formerly Northern Illinois Library System, then Prairie Area Library System) | RFSY | RAILS |
| 1979 | RAILS - Shorewood Service Center (formerly Heritage Trail Library System, then Prairie Area Library System) | SWSB | RAILS |
| 1317 | Rantoul Public Library (shares a prefix with Itasca Community Library) | RAN | IHLS |
| 2917 | Raymond A. Sapp Memorial Township Library | RAYG | RAILS |
| 0057 | Reavis High School Library | RVS | RAILS |
| 7578 | Reddick Library (Ottawa) | RLBB | RAILS |
| 7713 | Richard A. Mautino Memorial Library (Spring Valley) | RAM (was SPB) | RAILS |
| 1809 | Richland Community College | RCR | IHLS |
| 6087 | Richton Park Public Library District | RPS | RAILS |
| 0050 | RIVER BEND LIBRARY SYSTEM (now Prairie Area Library System) | PALS | RAILS |
| 0107 | River Bend Middle School | FMSG | RAILS |
| 1865 | River Forest Public Library | RFS | RAILS |
| 7000 | River Grove | RGS | RAILS |
| 8611 | River Ridge C.U.S.D. #210 | RRHY | RAILS |
| 0096 | River Valley District Library (Port Byron) | RVLG | RAILS |
| 0103 | Riverdale Elementary School | RIEG | RAILS |
| 2229 | Riverdale High School | RIHG | RAILS |
| 2230 | Riverdale Middle School | RIJG | RAILS |
| 1163 | Riverdale Public Library District | RDS | RAILS |
| 1403 | Riverside Public Library | RSS | RAILS |
| 7601 | Riverton Village Public Library (Riverton) | IHLS | |
| 2215 | Robert Morris College (Springfield) | RMR | IHLS |
| 0087 | Robert R. Jones Public Library District (Coal Valley) | CVPG | RAILS |
| 2076 | Robert W. Rowe Public Library District (Sheridan) | ROBB | RAILS |
| 8637 | Rochelle Elementary District #231 | RELY | RAILS |
| 8638 | Rochelle Township High School District #212 Library | RSLY | RAILS |
| 6084 | Rochester Public Library | IHLS | |
| 8644 | Rock Falls Middle School | ||
| 1516 | Rock Falls Public Library (Coloma Township) (shares same prefix 1516 with Sauk Valley College) | RFLY | RAILS |
| 8640 | Rock Falls Township High School #301 Library | RTLY | RAILS |
| 0070 | Rock Island Public Library | RIP | RAILS |
| 1606 | Rock Valley College | RVLY | RAILS |
| 8664 | Rockford Lutheran High School & Junior High | RLHY | RAILS |
| 1112 | Rockford Public Library | RPL | RAILS |
| 8643 | Rockford Public Schools, District #205 Library Media Centers | R44Y | RAILS |
| 0109 | Rockridge Unit #300 High School | ROCG | RAILS |
| 1270 | Rolling Meadows Library | RMK | RAILS |
| 1180 | ROLLING PRAIRIE LIBRARY SYSTEM | RPR | IHLS |
| 5291 | Romeoville Library Service Center (Inactive) | RCB | RAILS |
| 3012 | Roselle Public Library District | ROD | RAILS |
| 2303 | Round Lake Area Library | RLK | RAILS |
| 0037 | Roxana High School | GDA | IHLS |
| 0038 | Roxana Public Library | B1A | IHLS |
| 7011 | Sandwich District Library | SABB | RAILS |
| 0101 | SAUG Curriculum Library | ASD | RAILS |
| 1516/1622 | Sauk Valley College (shares same prefix 1516 with Coloma Township-Rock Falls Public Library) | SKL | RAILS |
| 8534 | Savanna Public Library District | SALY | RAILS |
| 8654 | Scales Mound C.U.S.D. #211 | SMLY | RAILS |
| 1257 | Schaumburg (Hoffman Estates Branch) | SBK | RAILS |
| 1257 | Schaumburg Township Public Library | SCK | RAILS |
| 1313 | Schiller Park Public Library | SPS | RAILS |
| 0105 | Schmaling Memorial Public Library District | FULG | RAILS |
| 0071 | Scott Community College (Iowa) | SCC | RAILS |
| 0072 | Scott County (Iowa) Library System | SEL | RAILS |
| 0113 | Selby Township Library District | SLBB | RAILS |
| 6059 | Seneca Public Library District | SEBB | RAILS |
| 1563 | Serena C.U.S.D. #2, Harding Grade School | HGB | RAILS |
| 1564 | Serena C.U.S.D. #2, Serena Grade School | SGBB | RAILS |
| 1562 | Serena C.U.S.D. #2, Serena High School | SHBB | RAILS |
| 1565 | Serena C.U.S.D. #2, Sheridan Grade School | SSBB | RAILS |
| 0183 | SHAWNEE LIBRARY SYSTEM | IHLS | |
| 0119 | Sheffield Public Library | SHFG | RAILS |
| 7553 | Shelbyville High School | IHLS | |
| 7360 | Shelbyville Public Library | IHLS | |
| 1699 | Sheridan Correctional Center (Inactive) | SHB | RAILS |
| 7592 | Sherman Public Library | IHLS | |
| 0206 | Sherrard Public Library | SHDG | RAILS |
| 1560 | Shorewood-Troy Public Library District | STB | RAILS |
| 0085 | Silvis Public Library | SVP | RAILS |
| 0004 | Six Mile Regional Library District | BAA | IHLS |
| 9094 | Skokie Public Library | SKK | RAILS |
| 1232 | Skokie Public Library | SKK | RAILS |
| 0084 | Smithton Public Library District | CCA | IHLS |
| 6836 | Somonauk Public Library District | SNBB | RAILS |
| 8656 | South Beloit C.U.S.D. #320 | SWLY | RAILS |
| 3853 | South Beloit Public Library District | SBLY | RAILS |
| 1350 | South Holland Public Library | SHS | RAILS |
| 7544 | South Shores Elementary School (Decatur) | IHLS | |
| 5939 | South Suburban College | TTS | RAILS |
| 7572 | Southeast Elementary School (Decatur) | IHLS | |
| 7602 | Springfield Art Association | IHLS | |
| 7513 | Springfield College | IHLS | |
| 0058 | St. Ambrose College Library | SAU | RAILS |
| 0053 | St. Charles Public Library District | SCD | RAILS |
| 0204 | St. Malachy School (has no code) | RAILS | |
| 7584 | St. Mary's Hospital (Decatur) | IHLS | |
| 1514 | St. Mary's School (Dixon) | RAILS | |
| 7559 | St. Patrick Elementary School (Decatur) | IHLS | |
| 7511 | St. Teresa High School (Decatur) | IHLS | |
| 0044 | Staunton Public Library | B6A | IHLS |
| 6090 | Steger-South Chicago Heights Public Library District | STS | RAILS |
| 7548 | Stephen Decatur Middle School (Decatur) | IHLS | |
| 8657 | Sterling C.U.S.D. #5 Libraries | SLLY | RAILS |
| 5929 | Sterling Public Library | STLY | RAILS |
| 7574 | Stevenson Elementary School (Decatur) | IHLS | |
| 7558 | Stewardson-Strasburg High School | IHLS | |
| 1803 | Stickney-Forest View Library District | SFS | RAILS |
| 8658 | Stillman Valley High Schools (Meridian Schools) | SP2Y | RAILS |
| 8538 | Stockton Township Public Library | SKLY | RAILS |
| 7541 | Stonington Elementary School | IHLS | |
| 7541 | Stonington Public Library | IHLS | |
| 1306 | Streator Public Library | SRBB | RAILS |
| 1140 | SUBURBAN LIBRARY SYSTEM (became Metropolitan Library System; now SWAN) | SLS | RAILS |
| 6879 | Sugar Grove Public Library | SGD | RAILS |
| 1954 | Sullivan High School | SSR | IHLS |
| 8102 | Summit | SAS | RAILS |
| 8659 | Sycamore C.U.S.D. #427 Libraries | SCLY | RAILS |
| 8539 | Sycamore Public Librar | SYLY | RAILS |
| 6828 | Taylorville Schools | IHLS | |
| 1810 | Taylorville Public Library (Warrensburg) | TAR | IHLS |
| 1308 | Thomas Ford Memorial Library (Western Springs) | TFS | RAILS |
| 7549 | Thomas Jefferson Middle School (Decatur) | IHLS | |
| 2431 | Thornton Public Library | THS | RAILS |
| 1561 | Three Rivers Public Library District (Channahon Branch) | TRBB | RAILS |
| 1561 | Three Rivers Public Library District (Minooka Branch) | TMBB | RAILS |
| 1321 | Tinley Park Public Library | TPS | RAILS |
| 0121 | Tiskilwa Public Library | RAILS | |
| 3032 | Tolono Township Library | TON | IHLS |
| 2299 | Town and Country (Elburn) | EBD | RAILS |
| 1211 | Township High School District 211 | DGK | RAILS |
| 0053 | Triad High School (Troy) | GHA | IHLS |
| 0097 | Trinity Medical Center Library | TRIG | RAILS |
| 0040 | Tri-Township Public Library District (Troy) | B3A | IHLS |
| 3033 | Tuscola Public Library | TUN | IHLS |
| 0084 | Twin Rivers District Library | CLN | RAILS |
| 7520 | Tyler School (New Lenox) | QTB | RAILS |
| 0089 | United Township High School Library | UTSG | RAILS |
| 1154 | University of Illinois - Chicago | UIC | RAILS |
| 0301 | University of St. Francis (Joliet) | SFB | RAILS |
| 6078 | University Park Public Library District | PSS | RAILS |
| 1230 | Urbana Free Library | URN | IHLS |
| 3042 | Urbana Junior High School | JUN | IHLS |
| 7554 | Ursuline Academy (Springfield) | IHLS | |
| 0099 | US Army Corps of Engineers Library | CRPG | RAILS |
| 0028 | Utica Public Library District | TAB | RAILS |
| 0048 | Valmeyer Public Library District/School | B7A | IHLS |
| 0017 | Venice Community Unit #3 | NOT ONLINE | IHLS |
| 0043 | Venice Public Library | B5A | IHLS |
| 1968 | Vernon Area Public Library District (Lincolnshire) | VEK | RAILS |
| 1805 | Vespasian Warner Public Library (Clinton) | CWR | IHLS |
| 2752 | Villa Park Public Library | VPD | RAILS |
| 1803 | Village of Oreana Library | ORR | IHLS |
| 0114 | Walnut Public Library | WALG | RAILS |
| 8660 | Warren C.U.S.D. #205 Library | WALY | RAILS |
| 6108 | Warren Township Public Library (also 8541) | WRLY | RAILS |
| 8541 | Warren Township Public Library (also 6108) | WRLY | RAILS |
| 1124 | Warren-Newport Bookmobile | WQK | RAILS |
| 1124 | Warren-Newport Public Library District (Gurnee) | WRK | RAILS |
| 4901 | Warrenville Public Library District | WVD | RAILS |
| A667 | Washington District Library Five Points | WDA | RAILS |
| A667 | Washington District Library Sunnyland Branch | WSA | |
| 7545 | Washington Elementary School (Decatur) | IHLS | |
| 0027 | Washington Park Library | WFA | IHLS |
| 3043 | Watseka Public Library | WAN | IHLS |
| 3089 | Wauconda Area Public Library | WUK | RAILS |
| 2233 | Waukegan Public Library | WKK | RAILS |
| 7582 | Weldon Public Library | IHLS | |
| 6653 | West Chicago Public Library District | WCD | RAILS |
| 7590 | West Sangamon Public Library (New Berlin) | IHLS | |
| 1498 | West Suburban Hospital | WSS | RAILS |
| 1310 | Westchester Public Library | WCS | RAILS |
| 0069 | Western District Public Library (Orion) | WDLG | RAILS |
| 1404 | Westmont Public Library | WMS | RAILS |
| 5143 | Wheaton Public Library | WHD | RAILS |
| 6091 | William Leonard Public Library District | ROS | RAILS |
| 7595 | Williamsville CUSD | IHLS | |
| 1239 | Wilmette Public Library District | WLK | RAILS |
| 6830 | Wilmington Public Library District | WLBB | RAILS |
| 7608 | Windsor Elementary School | IHLS | |
| 7579 | Windsor High School | IHLS | |
| 7521 | Windsor Public Library | IHLS | |
| 8661 | Winnebago C.U.S.D. #323 Library | WQLY | RAILS |
| 8543 | Winnebago Public Library District | WPLY | RAILS |
| 1240 | Winnetka-Northfield (Northfield Branch) | WBK | RAILS |
| 1240 | Winnetka-Northfield Public Library District | WNK | RAILS |
| 1687 | Wood Dale Public Library District | WDD | RAILS |
| 0010 | Wood River Public Library | BGA | IHLS |
| 1524 | Woodridge Public Library | WRS | RAILS |
| 7546 | Woodrow Wilson Residential Center (Decatur) | IHLS | |
| 1567 | Woodstock Public Library | WOL | RAILS |
| 2753 | Woodstock Public Library | WOL | RAILS |
| 1528 | Worth Public Library District | WOS | RAILS |
| 8525 | Wysox Township Library | WYLY | RAILS |
| 8540 | York Township Public Library | YTLY | RAILS |
| 6290 | Yorkville Public Library | YKBB | RAILS |
| 1126 | Zion-Benton Public Library District | ZIK | RAILS |