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 | |
| 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 | ALL | RAILS | HTLS: ALL |
| 1215 | Allerton Public Library (Monticello) | MON | IHLS | |
| 1145 | Alsip-Merrionette Park Public Library District | AMS | RAILS | |
| 0104 | Andalusia Township Library | AND | RAILS | |
| 7001 | Anderson/Oglesby (Markham) | MKS | RAILS | |
| 0102 | Annawan School | ASD | RAILS | |
| 0203 | Annawan-Alba Township Library | AAP | RAILS | |
| 5926 | Antioch Public Library | HRQ | RAILS | |
| 3722 | Aptakisic-Tripp CCSD 102 | BQQ | RAILS | |
| 1184 | Arlington Heights Memorial Library | AHK | RAILS | |
| 2770 | Atwood Public Library | ATR | IHLS | |
| 0059 | Augustana College | AUG | RAILS | |
| 1750 | Aurora Public Library | AOD | RAILS | |
| 1811 | Barclay Public Library of Illini Township | WAR | IHLS | |
| 1487 | Barrington Public Library District | BAK | RAILS | |
| 9800 | Bartlett Public Library District | BTD | RAILS | |
| 6173 | Batavia Public Library District | BLD | RAILS | |
| 1381 | Bedford Park Library District | BPS | RAILS | |
| 0304 | Beecher | BCS | RAILS | |
| 0007 | Belleville Public Library | BDA | IHLS | |
| 1731 | Bellwood Public Library | BWS | RAILS | |
| 1437 | Bensenville Community Public Library District | BND | RAILS | |
| 1993 | Berkeley Public Library | BKS | RAILS | |
| 2957 | Berwyn Public Library | BYS | RAILS | |
| 0031 | Bethalto Public Library | BTA | IHLS | |
| 0060 | Bettendorf (Iowa) Public Library | BPL | RAILS | |
| 5563 | Big Rock Library | RAILS | ||
| 0061 | Black Hawk College | BHC | 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 | |
| 1555 | Bourbonnais Public Library District | BDB | RAILS | |
| 6800 | Bradley Public Library District | BRB | RAILS | |
| 0029 | Breese Public Library | BRA | IHLS | |
| 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 | |
| 1523 | Byron Public Library District | BYL | 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 | |
| 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 | |
| 1002 | Central High School (Burlington) | BUD | RAILS | |
| 0028 | Centreville Library | BQA | IHLS | |
| 1305 | Champaign Public Library | CHN | IHLS | |
| 3035 | Chanute Air Force Base Library | QCN | IHLS | |
| 1235 | Charleston Carnegie Public Library | CRN | 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 | |
| 5920 | Coal City Public Library | CCB | RAILS | |
| 1304 | College of DuPage | COD | RAILS | |
| 1516 | Coloma Township-Rock Falls Public Library shares same prefix 1516 with Sauk Valley College | RFL | RAILS | |
| 0095 | Colona School District | CSD | RAILS | |
| 0084 | Colona Township Public Library | CLN | RAILS | |
| 0026 | Columbia Public Library | BOA | IHLS | |
| 1377 | Cook County Law Library | CCC | RAILS | |
| 1122 | Cook Memorial Public Library District (Libertyville) | LIK | RAILS | |
| 0091 | Cordova District Library | COR | RAILS | |
| 2525 | Cove School (Northbrook) | CNK | RAILS | |
| 7651 | Crestwood | CWS | RAILS | |
| 1886 | Crete Public Library District | CTS | RAILS | |
| 2306 | Crystal Lake Public Library | CLK | 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 | |
| 1202 | Decatur Public Library | DPR | IHLS | |
| 0064 | Deere & Co. Library | DCL | RAILS | |
| 9094 | Deerfield Public Library | DFK | RAILS | |
| 2065 | DeKalb Public Library | DKL | RAILS | |
| 1601 | Delos F. Diggins Public Library (Harvard) | HRL | RAILS | |
| 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 | |
| 1515 | Dixon Public Library | DXL | RAILS | |
| 1146 | Dolton Public Library District | DOS | RAILS | |
| 3039 | Douglas Township Library (Gilman) | GIN | IHLS | |
| 1191 | Downers Grove Public Library | DGS | RAILS | |
| 1783 | Fox River Valley Public Library District (Dundee) | DUK | RAILS | |
| 1336 | DUPAGE LIBRARY SYSTEM | DPD | RAILS | |
| 1337 | DUPAGE LIBRARY SYSTEM | DPD | RAILS | |
| 1817 | Elizabeth Titus Memorial Library (Sullivan) | SUR | IHLS | |
| 0005 | East Alton Public Library | BBA | IHLS | |
| 0086 | East Moline Correctional Center | PRI | RAILS | |
| 0065 | East Moline Public Library | EMP | 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 | |
| 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 | |
| 3841 | Elgin Community Unit School District U46 | UFK | RAILS | |
| 1250 | Elk Grove Village Public Library | ELK | RAILS | |
| 8514 | Ella Johnson Memorial Public Library | EJM | RAILS | |
| 1135 | Elmhurst Public Library | EHS | RAILS | |
| 1208 | Elmwood Park Library District | EPS | RAILS | |
| 2707 | Erie Public Library | ERI | RAILS | |
| 1192 | Evanston Public Library | EVK | RAILS | |
| 2778 | Evergreen Park Public Library | EVS | RAILS | |
| 0015 | Fairview Heights Public Library | BIA | IHLS | |
| 1249 | Flossmoor Public Library | FMS | RAILS | |
| 2026 | Forest Park Public Library | FPS | RAILS | |
| 1749 | Forsyth Public Library | FOR | IHLS | |
| 2186 | Fossil Ridge Public Library District (Braidwood) | FRB | RAILS | |
| 2186 | Fossil Ridge Public Library District(Bookmobile) | FBB | RAILS | |
| 0094 | Franciscan University | MSC | RAILS | |
| 8510 | Freeport Public Library | FPL | RAILS | |
| 3805 | Fox Lake Public Library | FLK | RAILS | |
| 2274 | Fox River Grove Public Library | FRQ | RAILS | |
| 1203 | Frankfort Public Library District | FRS | RAILS | |
| 1316 | Franklin Park Public Library District | FPD | RAILS | |
| 8509 | Franklin Grove Public Library | FGLY | RAILS | |
| 3090 | Fremont Township Public Library (Mundelein) | MUK | RAILS | |
| 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 | FES | RAILS | |
| 0108 | Fulton High School | FHS | RAILS | |
| 1113 | Gail Borden Public Library | ELG | RAILS | |
| 0090 | Geneseo District Public Library | GPL | RAILS | |
| 0120 | Geneseo School District | GHS | RAILS | |
| 0205 | Genesis Medical Center | ILI | RAILS | |
| 0052 | Geneva Public Library District | GVD | 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 | |
| 0202 | Great River Medical Center | GRM | RAILS | |
| 0517 | Graves-Hume Public Library District (Mendota) | GVB | RAILS | |
| 6109 | Grayslake | GRK | RAILS | |
| 1814 | Green Hills Public Library District | GHS | RAILS | |
| 0032 | Greenville Public Library | BUA | IHLS | |
| 2770 | Hammond Public Library | HMR | IHLS | |
| 0098 | Hampton School District | HAM | RAILS | |
| 2125 | Hanover Township Library | HNL | RAILS | |
| 0034 | Hartford Public Library | BWA | IHLS | |
| 1563 | Harding Grade School | HGB | 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 Mathes 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 | |
| 1000 | Highland Park Public Library | HPK | RAILS | |
| 1992 | Hillside Public Library | HSS | RAILS | |
| 1279 | Hinsdale Public Library | HDS | RAILS | |
| 1301 | Hindu Temple of Greater Chicago | |||
| 5930 | Hodgkins | HKS | RAILS | |
| 2889 | Homer Township Public Library District | HDB | RAILS | |
| 1311 | Homewood Public Library | HWS | RAILS | |
| 1742 | Homewood-Flossmoor High School | HFS | RAILS | |
| 6839 | Huntley Area Public Library District | HUK | RAILS | |
| 1165 | IL Library materials | ISL | IHLS | |
| 1129 | IL State Library | ISL | IHLS | |
| 2156 | Illiopolis Public Library | ILR | IHLS | |
| 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 | ITD | RAILS | |
| 1747 | IVC Center – Rolling Prairie | IHLS | ||
| 0057 | Jerseyville High School | GKA | IHLS | |
| 0033 | Jerseyville Public Library | BVA | IHLS | |
| 6164 | Johnsburg Public Library | JPL | RAILS | |
| 7695 | Joliet Catholic Academy | XFB | RAILS | |
| 1967 | Joliet Public Library | JPB | RAILS | |
| 7519 | Joliet THSD 204 (Central Campus) | UTB | RAILS | |
| 0019 | Joliet THSD 204 (West Campus) | DOB | RAILS | |
| 2784 | Justice Public Library | JDS | RAILS | |
| 1558 | Kankakee Public Library | KKB | RAILS | |
| 0093 | Kaplan College | AIC | RAILS | |
| 0054 | Kenilworth Public Library District | KNK | RAILS | |
| 7943 | Kishwaukee College Library | 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 | LAC | RAILS | |
| 2077 | LaSalle Public Library | LSB | RAILS | |
| 0100 | LeClaire Community Library | RAILS | ||
| 1559 | Lemont Public Library District | LMB | RAILS | |
| 0001 | LEWIS & CLARK LIBRARY SYSTEM | IHLS | ||
| 1137 | Lewis O. Flom Public Library (Lansing) | LSS | RAILS | |
| 9846 | Limestone Township Public Library | LIB | RAILS | |
| 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 | |
| 1812 | Lovington Township Library | LOR | IHLS | |
| 3002 | Loyola Academy | LOK | RAILS | |
| 1722 | LTA Program (College of DuPage) | RAILS | ||
| 1529 | Lyons Public Library | LYS | RAILS | |
| 0056 | Madison High School | GJC | IHLS | |
| 0039 | Madison Public Library | B2A | IHLS | |
| 3031 | Mahomet Township Public Library | MAN | IHLS | |
| 8001 | Manhattan Public Library District | MTB | RAILS | |
| 3702 | Manteno High School | ZAB | RAILS | |
| 6990 | Manteno Public Library District | MNB | RAILS | |
| 1804 | Marrowbone Township Library (Bethany) | MBR | IHLS | |
| 3045 | Marshall High School | YMN | IHLS | |
| 3040 | Marshall Public Library | MLN | IHLS | |
| 0045 | Mater Dei High School (Breese) | GEA | IHLS | |
| 7358 | Matson Public Library | PRB | RAILS | |
| 1486 | Matteson Public Library | MTS | RAILS | |
| 1312 | Maywood Public Library | MWS | 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 | |
| 3041 | Mercy Hospital (Urbana) | XMN | IHLS | |
| 6878 | Messenger Public Library (North Aurora) | NAD | RAILS | |
| 0018 | Metro East Lutheran High School (Edwardsville) | GAA | IHLS | |
| 1140 | RAILS | SLS | RAILS | |
| 1614 | Midlothian Public Library | MDS | RAILS | |
| 0110 | Mineral Gold Public Library | MGP | RAILS | |
| 0035 | Mississippi Valley Public Library District | BXA | IHLS | |
| 1985 | Mokena Community Public Library District | MKB | RAILS | |
| 0067 | Moline Public Library | MPP | RAILS | |
| 2222 | Montini High School | MOD | RAILS | |
| 0118 | Moore Memorial Library District | MML | RAILS | |
| 9957 | Morris Area Public Library District | MRB | RAILS | |
| 0024 | Morrison Talbott Library (Waterloo) | BNA | IHLS | |
| 8070 | Morton Arboretum | MAS | RAILS | |
| 1245 | Morton Grove Public Library | MGK | RAILS | |
| 1174 | Mount Prospect Public Library | MPK | RAILS | |
| 3038 | Moyer Library (Gibson City) | GCN | IHLS | |
| 1815 | Mt. Pulaski Public Library District | MPR | IHLS | |
| 1808 | Mt. Zion Township Library | MZR | 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 | |
| 0501 | Newman Central Catholic High School | NCL | RAILS | |
| 1984 | New Lenox Township Library | NLB | RAILS | |
| 1318 | Nichols Library (Naperville) | NID | RAILS | |
| 1491 | Niles Public Library District | NIK | RAILS | |
| 6117 | Nippersink Public Library (Richmond) | NPLY | 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 | |
| 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 | MOR | RAILS | |
| 7518 | Oglesby Public Library District | OGB | 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 | |
| 1139 | Park Forest Public Library | PFS | RAILS | |
| 1467 | Park Ridge Public Library | PRK | RAILS | |
| 3036 | Parkland Community College | ZPN | IHLS | |
| 8530 | Pecatonica Public Library | PTL | RAILS | |
| 2890 | Peotone Public Library District | PEB | RAILS | |
| 2078 | Peru Public Library | PUB | RAILS | |
| 3037 | Philo Township Public Library | PHN | IHLS | |
| 1907 | Plainfield Public Library District | PLB | RAILS | |
| 0378 | Plano Centennial School | 7HB | RAILS | |
| 2891 | Plano Community Library District | LRB | RAILS | |
| 0378 | Plano High School | ZGB | RAILS | |
| 0378 | Plano Middle School | 9HB | RAILS | |
| 0378 | P.H. Miller School (Plano) | 8HB | RAILS | |
| 1339 | Poplar Creek Library District | SMD | RAILS | |
| 0050 | PRAIRIE AREA LIBRARY SYSTEM (formerly River Bend Library System) | PALS | RAILS | |
| 1258 | PRAIRIE AREA LIBRARY SYSTEM (formerly Northern Illinois Library System) | PALS | RAILS | |
| 1979 | PRAIRIE AREA LIBRARY SYSTEM (formerly Heritage Trail Library System) | PALS | RAILS | |
| 2783 | Prairie State College | PCS | RAILS | |
| 0083 | Prairie Trails Public Library District | PTS | RAILS | |
| 0306 | Princeton THSD 500 | UFB | RAILS | |
| 0115 | Prophetstown High School | PHS | 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 | |
| 2079 | Putnam County Library | PCV | RAILS | |
| 1317 | Rantoul Public Library | RAN | IHLS | |
| 0057 | Reavis High School Library | RVS | RAILS | |
| 7578 | Reddick Library (Ottawa) | OTB | 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 | FMS | RAILS | |
| 1865 | River Forest Public Library | RFS | RAILS | |
| 7000 | River Grove | RGS | RAILS | |
| 0096 | River Valley District Library | PBP | RAILS | |
| 0103 | Riverdale Elementary School | RIE | RAILS | |
| 2230 | Riverdale Middle School | RIJ | RAILS | |
| 2229 | Riverdale High School | RIJ | RAILS | |
| 1163 | Riverdale Public Library District | RDS | RAILS | |
| 1403 | Riverside Public Library | RSS | RAILS | |
| 2215 | Robert Morris College (Springfield) | RMR | IHLS | |
| 0087 | Robert R. Jones Public Library District (Coal Valley) | CVP | RAILS | |
| 2076 | Robert W. Rowe Public Library District | ROB | RAILS | |
| 0070 | Rock Island Public Library | RIP | RAILS | |
| 1606 | Rock Valley College | RVL | RAILS | |
| 1112 | Rockford Public Library | RPL | RAILS | |
| 0109 | Rockridge Unit #300 | ROC | 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 Township Public Library | SAB | 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 | |
| 1257 | Schaumburg (Hoffman Estates Branch) | SBK | RAILS | |
| 1257 | Schaumburg Township Public Library | SCK | RAILS | |
| 1313 | Schiller Park Public Library | SPS | RAILS | |
| 0105 | Schmaling Public Library District | FUL | RAILS | |
| 0071 | Scott Community College (Iowa) | SCC | RAILS | |
| 0072 | Scott County (Iowa) Library System | SEL | RAILS | |
| 0113 | Selby Township Library District | SLL | RAILS | |
| 6059 | Seneca Public Library District | SEB | RAILS | |
| 1564 | Serena Grade School | SGB | RAILS | |
| 0183 | SHAWNEE LIBRARY SYSTEM | IHLS | ||
| 0119 | Sheffield Public Library | SHF | RAILS | |
| 1699 | Sheridan Correctional Center (Inactive) | SHB | RAILS | |
| 1565 | Sheridan Grade School | SSB | RAILS | |
| 0206 | Sherrard Public Library | SHD | RAILS | |
| 0206 | Sherrard Public Library (Mobile Library) | SBD | 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 | SNB | RAILS | |
| 1350 | South Holland Public Library | SHS | RAILS | |
| 5939 | South Suburban College | TTS | RAILS | |
| 0058 | St. Ambrose College Library | SAU | RAILS | |
| 0053 | St. Charles Public Library District | SCD | RAILS | |
| 0204 | St. Malachy School (has no code) | RAILS | ||
| 0044 | Staunton Public Library | B6A | IHLS | |
| 6090 | Steger-South Chicago Heights Public Library District | STS | RAILS | |
| 1803 | Stickney-Forest View Library District | SFS | RAILS | |
| 1140 | SUBURBAN LIBRARY SYSTEM (became Metropolitan Library System; now RAILS) | SLS | RAILS | |
| 1954 | Sullivan High School | SSR | IHLS | |
| 8102 | Summit | SAS | RAILS | |
| 1810 | Taylorville Public Library (Warrensburg) | TAR | IHLS | |
| 1308 | Thomas Ford Memorial Library (Western Springs) | TFS | RAILS | |
| 2431 | Thornton Public Library | THS | RAILS | |
| 1561 | Three Rivers Public Library District (Channahon Branch) | TRB | RAILS | |
| 1561 | Three Rivers Public Library District (Minooka Branch) | TMB | 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 | TRI | 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 | UTS | 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 | |
| 0099 | US Army Corps of Engineers Library | CRP | 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 | WAL | 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 | ||
| 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 | |
| 6653 | West Chicago Public Library District | WCD | RAILS | |
| 1498 | West Suburban Hospital | WSS | RAILS | |
| 1310 | Westchester Public Library | WCS | RAILS | |
| 0069 | Western Township Public Library (Orion) | WTP | RAILS | |
| 1404 | Westmont Public Library | WMS | RAILS | |
| 5143 | Wheaton Public Library | WHD | RAILS | |
| 6091 | William Leonard Public Library District | ROS | RAILS | |
| 1239 | Wilmette Public Library District | WLK | RAILS | |
| 6830 | Wilmington Public Library District | WLB | 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 | |
| 1567 | Woodstock Public Library | WOL | RAILS | |
| 2753 | Woodstock Public Library | WOL | RAILS | |
| 1528 | Worth Public Library District | WOS | RAILS | |
| 6290 | Yorkville Public Library | YKB | RAILS | |
| 1126 | Zion-Benton Public Library District | ZIK | RAILS |