| A Herr Smith & E E Smith Library | CDI |
| Acorn Public Library District | TZ8 |
| Addison Public Library | JVK |
| Albion Public Library | AP7 |
| Aledo Mercer-Carnegie Public Library District | JYL |
| Algonquin Area Public Library District | GK5 |
| Allin Township Library | KB1 |
| Alpha Park Public Library District | ISF |
| Alsip-Merrionette Park Public Library | JCF |
| Altamont Public Library | IA2 |
| Amity Township Public Library | KE0 |
| Andalusia Township Library | ZBV |
| Anderson Oglesby Public Library | TW3 |
| Annawan-Alba Township Library | ZBX |
| Antioch Public Library District | JX3 |
| Arcola Public Library District | IB0 |
| Argenta-Oreana Public Library District | II5 |
| Arlington Heights Memorial Library | JBL |
| Arthur Public Library District | IF0 |
| Ashland Public Library District | JGD |
| Ashley Public Library | JN2 |
| Assumption Public Library District | II6 |
| Astoria Public Library District | JYN |
| Athens Municipal Library | I8A |
| Atkinson Public Library District | JYO |
| Atlanta Public Library | KE1 |
| Atwood-Hammond Public Library District | II7 |
| Auburn Public Library | IH2 |
| Aurora Public Library | JSE |
| Ayer Public Library District | ISG |
| Barclay Public Library District | II8 |
| Barrington Area Library | GK6 |
| Barry Public Library | JGF |
| Bartlett Public Library District | JSQ |
| Batavia Public Library District | JVX |
| Beardstown Public Library | JGH |
| Bedford Park Public Library District | TW7 |
| Beecher Public Library District | BQJ |
| Belleville Public Library | VQ0 |
| Belleville Public Library | JN3 |
| Bellwood Public Library | TW9 |
| Bement Public Library District | II0 |
| Bensenville Community Public Library District | JOY |
| Benton Public Library District | ZMI |
| Berkeley Public Library | TV3 |
| Bertolet Memorial Library District | LD2 |
| Berwyn Public Library | TV7 |
| Bethalto Public Library District | IH3 |
| Blandinsville-Hire Library District | JYQ |
| Bloomingdale Public Library | JOZ |
| Bloomington Public Library | JCH |
| Blue Island Public Library | TU2 |
| Blue Mound Memorial Library District | GD6 |
| Blue Ridge Township Public Library | IK0 |
| Bluffs Public Library | JGJ |
| Bond Public Library | OD7 |
| Bourbonnais Public Library District | OD9 |
| Bradford Public Library District | IQX |
| Bradley Public Library District | OE8 |
| Breese Public Library | JN4 |
| Bridgeview Public Library | TU5 |
| Brighton Memorial Public Library | YW4 |
| Brimfield Public Library District | JWS |
| Broadview Public Library District | TU6 |
| Brookfield Free Public Library | TU7 |
| Brown County Public Library District | JGI |
| Bryan-Bennett Library | IA5 |
| Bunker Hill Public Library | IH4 |
| Bushnell Public Library District | JYR |
| Byron Public Library District | JX6 |
| C E Brehm Memorial Public Library District | IA4 |
| Cahokia Public Library District | JN5 |
| Cairo Public Library | ZRO |
| Calumet City Public Library | TT5 |
| Calumet Park Public Library | TT6 |
| Camargo Township District Library | IK1 |
| Cambridge Public Library District | JYS |
| Camp Point Public Library District | JGL |
| Carbondale Public Library | XL4 |
| Carlinville Public Library | IH5 |
| Carmi Public Library | ZVO |
| Carnegie-Schuyler Library | II9 |
| Carol Stream Public Library | JST |
| Carrier Mills-Stonefort Public Library District | ZXO |
| Carrollton Public Library | IH6 |
| Carterville Public Library | YGO |
| Carthage Public Library District | JGN |
| Cary Area Public Library District | JX7 |
| Case-Halstead Public Library | JN6 |
| Casey Township Library | IL0 |
| Caseyville Public Library District | JN7 |
| Catlin Public Library District | IO1 |
| Central Citizens' Library District | CZX |
| Central Public Library District | YII |
| Centralia Regional Library District | IA6 |
| Centralia Regional Library District | ILCSB |
| Centralia Regional Library District | L#Z |
| Centralia Regional Library District | L$V |
| Centralia Regional Library District | L@Y |
| Centreville Public Library | C8U |
| Chadwick Public Library District | JX8 |
| Champaign Public Library | IKG |
| Charleston Carnegie Public Library | IV0 |
| Chatham Area Public Library District | IV2 |
| Chatsworth Township Library | KL1 |
| Cheona Public Library | KO1 |
| Cherry Valley Public Library District | JX9 |
| Chester Public Library | YOO |
| Chicago Heights Free Public Library | TT9 |
| Chicago Public Library | CGP |
| Chicago Ridge Public Library | TS6 |
| Chillicothe Public Library District | ISI |
| Chrisman Public Library | IX0 |
| Christopher Public Library | YQI |
| Cicero Public Library | TS8 |
| Cissna Park Community Library District | IX1 |
| City of Woodstock Public Library | LF8 |
| Clarendon Hills Public Library | TR9 |
| Clayton Public Library District | JGQ |
| Clifton Public Library | V7L |
| Clinton Township Public Library | LF6 |
| Clover Public Library District | JZV |
| Coal City Public Library District | OF9 |
| Colchester District Library | JYT |
| Collinsville Memorial Public Library | IH7 |
| Columbia Public Library | JN8 |
| Cook Memorial Public Library District | JBI |
| Cordova District Library | ZCV |
| Cortland Community Library | O3C |
| Coulterville Public Library | YWO |
| Crab Orchard Public Library District | L@U |
| Crab Orchard Public Library District | L@X |
| Crab Orchard Public Library District | YYO |
| Creston-Dement Library District | C$D |
| Crestwood Public Library District | TQ6 |
| Crete Public Library District | TQ7 |
| Creve Coeur Public Library District | JWT |
| Crystal Lake Public Library | GK7 |
| Cutler Public Library | XRI |
| Dahlgren Public Library | XSO |
| Danvers Township Library | KP0 |
| Danville Public Library | JPI |
| Daugherty Public Library District | JN9 |
| Decatur Public Library | JNE |
| Deer Creek District Library | JWU |
| Deerfield Public Library | IVY |
| DeKalb Public Library | JY2 |
| Des Plaines Public Library | GK8 |
| Des Plaines Valley PLD (Crest Hill) | OI5 |
| Des Plaines Valley PLD (Lockport) | OI4 |
| Divernon Township Library | ZW# |
| Dixon Public Library | JY3 |
| Dodge Memorial Public Library District | XVI |
| Dolton Public Library District | TP4 |
| Dominy Memorial Library | KP1 |
| Dongola Public Library District | XVO |
| Downers Grove Public Library | JCX |
| Doyle Public Library District | D3Y |
| Dry Point Township Library | ZY# |
| Dundee Township Public Library District | GK9 |
| Dunlap Public Library District | IDV |
| DuQuoin Public Library | XYO |
| Earl Township Public Library | OI7 |
| East Alton Public Library District | IH8 |
| East Dubuque District Library | JY4 |
| East Moline Public Library | ZDX |
| East St. Louis Public Library | JO2 |
| Edward Chipman Public Library | OI9 |
| Edwardsville Public Library | IH9 |
| Eisenhower Public Library District | TP7 |
| El Paso Public Library | KR1 |
| Ela Area Public Library District | IHY |
| Eldorado Memorial Public Library District | UEO |
| Elizabeth Titus Memorial Library | IV3 |
| Elizabeth Township Library | JY5 |
| Elk Grove Village Public Library | IL2 |
| Elkhart Public Library District | IV4 |
| Ella Johnson Memorial Public Library District | JZ4 |
| Elmhurst Public Library | JBU |
| Elmwood Park Public Library | TO2 |
| Elwood Township Carnegie Library | JC7 |
| Erie Public Library District | ZDZ |
| Eureka Public Library District | JWZ |
| Evans Public Library | IA7 |
| Evanston Public Library | IHE |
| Evansville Public Library | UQ9 |
| Evergreen Park Public Library | TO5 |
| Fairfield Public Library | IA9 |
| Fairview Heights Public Library | JO3 |
| Farmer City Public Library | UM8 |
| Farmersville-Waggoner Public Library District | YW5 |
| Farmington Public Library District | JYW |
| Filger Public Library | UM9 |
| Flagg-Rochelle Public Library District | LE9 |
| Flora Public Library | IB1 |
| Flossmoor Public Library | TO7 |
| Fondulac District Library | IDY |
| Forest Park Public Library | TO9 |
| Forrest Public Library District | UO2 |
| Forreston Public Library | JY6 |
| Forsyth Public Library | IV5 |
| Fossil Ridge Public Library District | OJ3 |
| Fountaindale Public Library District (Bolingbrook) | OJ4 |
| Fountaindale Public Library District (Romeoville) | OJ5 |
| Four Star Public Library District | IRX |
| Fox Lake Public Library District | GL3 |
| Fox River Grove Public Library District | JY7 |
| Frank Bertetti Benld Public Library | F4K |
| Frankfort Public Library District | TM3 |
| Franklin Grove Public Library | JY8 |
| Franklin Park Public Library District | JZD |
| Freeburg Area Library District | F4L |
| Freeport Public Library | JY9 |
| Fremont Public Library District | GL4 |
| Gail Borden Public Library District | IF9 |
| Galatia Public Library District | L#T |
| Galena Public Library District | JZ2 |
| Galesburg Public Library | JYX |
| Galva Public Library District | ISK |
| Geneseo Public Library District | JYY |
| Geneva Public Library District | JSY |
| Genoa Public Library District | JZ3 |
| Georgetown Public Library | JU1 |
| Germantown Public Library District | G3M |
| Gillespie Public Library | IJ3 |
| Gilman - Danforth District Library | JW0 |
| Girard Township Library | IJ4 |
| Glen Carbon Centennial Library | YW6 |
| Glen Ellyn Public Library | JCW |
| Glencoe Public Library | JAH |
| Glenside Public Library District | JVJ |
| Glenview Public Library | FM0 |
| Glenwood-Lynwood Public Library District | TM5 |
| Golconda Public Library | US6 |
| Goose Creek Township Carnegie Library | JW1 |
| Grand Prairie of the West Public Library District | IP8 |
| Grand Tower Public Library | US8 |
| Grande Prairie Public Library District | TM8 |
| Granite City Public Library District | IJ5 |
| Granite City Public Library District | VU1 |
| Grant Park Public Library | OJ9 |
| Graves-Hume Public Library District | OK8 |
| Grayslake Area Public Library District | GL5 |
| Grayville Carnegie Public Library | UT1 |
| Greater West Central Public Library District | JGE |
| Green Hills Public Library District | TL4 |
| Greenfield Public Library | IJ7 |
| Greenup Township Carnegie Library | IV6 |
| Greenville Public Library | IJ8 |
| Greig Memorial Library | JZP |
| Gridley Public Library District | UO3 |
| Griggsville Public Library | JGS |
| H.A. Peine Memorial Library | JXN |
| Hamilton Public Library | JGU |
| Hanover Township Library | JZ5 |
| Harrisburg Public Library District | UX7 |
| Hartford Public Library District | IJ9 |
| Harvard Diggins Public Library | JZ6 |
| Harvey Public Library District | CF0 |
| Havana Public Library District | JZH |
| Hayner Public Library District | IK2 |
| Hayner Public Library District | IK3 |
| Hecker Public Library | JO4 |
| Helen M. Plum Memorial Library | JFL |
| Helen Matthes Library | IV7 |
| Henderson County Public Library District | JZI |
| Henry C. Adams Memorial Library | ZEV |
| Henry Public Library | ISP |
| Herrick Township Public Library | IV8 |
| Herrin City Library | UU4 |
| Heyworth Public Library District | UO4 |
| Highland Park Public Library | IHV |
| Highwood Public Library | GL6 |
| Hillsboro Public Library | IK5 |
| Hillside Public Library | TL7 |
| Hinsdale Public Library | TL9 |
| Hodgkins Public Library District | TK4 |
| Homer Community Library | JX1 |
| Homer Township Public Library District | ON3 |
| Hometown Public Library | TK6 |
| Homewood Public Library District | JNG |
| Hoopeston Public Library District | JY0 |
| Hope Welty Public Library District | IV9 |
| Hudson Area Public Library District | UO5 |
| Huntley Area Public Library District | GL7 |
| Ida Public Library | JX5 |
| Illinois Prairie District Public Library | IEQ |
| Illiopolis/Niantic Public Library District | IY2 |
| Indian Prairie Public Library District | TJ7 |
| Indian Trails Public Library District | JAG |
| Ira C. Reed Public Library | JXP |
| Itasca Community Library | JSU |
| Jacksonville Public Library | JBF |
| Jerseyville Public Library | IK6 |
| John Mosser Public Library District | JYK |
| Johnsburg Public Library District | LD5 |
| Johnston City Public Library | UU9 |
| Joliet Public Library | ON8 |
| Joliet Public Library - West Branch | J8Y |
| Joliet Public Library (West Outlet) | I9F |
| Jonesboro Public Library | UV2 |
| Julia Hull District Library | LB9 |
| Justice Public Library District | AAO |
| Kaneville Public Library | JSV |
| Kankakee Public Library | OO3 |
| Kansas Community Memorial Library | LV1 |
| Kewanee Public Library District | IEV |
| Kirkland Public Library | JZ8 |
| Kitchell Mem Libr | ZYR |
| Knoxville Public Library | JZJ |
| Lacon Public Library District | JXI |
| Ladd Public Library District | OO5 |
| LaGrange Park Public Library District | BCI |
| LaGrange Public Library | BFI |
| LaHarpe Carnegie Public Library District | JZK |
| Lake Bluff Public Library | GL8 |
| Lake Forest Library | JAI |
| Lake Villa Public Library District | JAS |
| LaMoille-Clarion Public Library District | OO6 |
| Lanark Public Library | JZ9 |
| Lansing Public Library | BGI |
| LaSalle Public Library | OO9 |
| Lawrence Public Library District | IB4 |
| Lebanon Public Library | JO5 |
| Leepertown Township Public Library | OP5 |
| Lemont Public Library District | XK4 |
| Lena Community District Library | LD3 |
| Lewistown Carnegie Public Library District | JZL |
| Lexington Public Library District | UO6 |
| Lillie M. Evans Memorial Library | ISQ |
| Limestone Township Library | I9H |
| Lincoln Library | ILM |
| Lincoln Public Library District | IY3 |
| Lincolnwood Public Library District | ILE |
| Lisle Library District | BNO |
| Litchfield Carnegie Public Library | IK7 |
| Lostant Community Library | OQ4 |
| Louis Latzer Memorial Public Library | IK4 |
| Lovington Public Library District | GD7 |
| Lyons Public Library | BQI |
| Mackinaw District Public Library | IER |
| Macomb Public Library District | JZM |
| Madison Public Library | IK8 |
| Mahomet Public Library District | LW1 |
| Malta Township Public Library | LD6 |
| Manhattan Public Library District | OQ8 |
| Manito Public Library District | JZB |
| Manteno Public Library District | OR6 |
| Maple Park Public Library District | LD7 |
| Maquon Public Library District | JZN |
| Marengo Public Library District | LD8 |
| Marion Carnegie Library | UW3 |
| Marissa Area Public Library District | UW8 |
| Maroa Public Library District | IY4 |
| Marquette Heights Public Library | JXJ |
| Marrowbone Public Library District | IY5 |
| Marseilles Public Library | OR9 |
| Marshall Area Public Library District | M#L |
| Marshall Public Library | LX1 |
| Martin Township Public Library | UO7 |
| Martinsville Public Library District | MF0 |
| Mascoutah Public Library | JO6 |
| Mason City Public Library | IY6 |
| Mason Memorial Public Library | IVB |
| Matson Public Library | OT4 |
| Matteson Public Library | BVI |
| Mattoon Public Library | MG0 |
| Maywood Public Library District | BXI |
| M-C River Valley Public Library District | JGG |
| McCook Public Library District | CFO |
| McCoy Memorial Library | UXO |
| McHenry Public Library District | GL9 |
| McHenry-Nunda Public Library District | GO2 |
| Melrose Park Public Library | CJO |
| Melvin Public Library | MG1 |
| Messenger Public Library of North Aurora | TYV |
| Metropolis Public Library | UX6 |
| Midlothian Public Library | CKI |
| Milford District Library | MH0 |
| Mills & Petrie Memorial Library and Gymnasium | JX4 |
| Millstadt Library | JO7 |
| Mineral-Gold Public Library District | ZFX |
| Mokena Community Public Library District | OU9 |
| Moline Public Library | IDO |
| Monticello Township Library | CDO |
| Moore Memorial Library District | ZLW |
| Morris Area Public Library District | OV4 |
| Morrison & Mary Wiley Public Library | IPM |
| Morrison-Talbott Library | JO8 |
| Morton Grove Public Library | IMT |
| Morton Public Library District | IST |
| Mound City Public Library | UX8 |
| Mounds Public Library | UX9 |
| Mount Carmel Public Library | IB6 |
| Mount Carroll Township Public Library | LE2 |
| Mount Hope-Funks Grove Township Library District | UO8 |
| Mount Morris Public Library | LE3 |
| Mount Olive Public Library | IK9 |
| Mount Prospect Public Library | GO3 |
| Mount Pulaskia Public Library District | IY7 |
| Mount Zion Public Library District | IY8 |
| Moweaqua Public Library District | MZ# |
| Moyer Library | MI0 |
| Nancy L. McConathy Public Library District | DFO |
| Naperville Public Libraries | JFN |
| Nashville Public Library | JO9 |
| Nauvoo Public Library | JGK |
| Neoga Public Library District | MT# |
| Neponset Public Library | ISV |
| New Athens District Library | JP2 |
| New Baden Public Library | JP4 |
| New Lenox Public Library District | OV7 |
| New Windsor Public Library District | JZO |
| Newman Township Library | MJ1 |
| Newton Public Library | IB7 |
| Niles Public Library District | GO4 |
| Nippersink Public Library District | LE8 |
| Nokomis Public Library | IP2 |
| Normal Public Library | KAA |
| Norris City Memorial Public Library District | L$J |
| Norris City Memorial Public Library District | UZ1 |
| North Chicago Public Library | GO5 |
| North Riverside Public Library District | DIO |
| North Suburban Public Library District | I#X |
| North Suburban Public Library District | LD4 |
| Northbrook Public Library | INO |
| Northlake Public Library District | DJI |
| Oak Brook Public Library | JSZ |
| Oak Lawn Public Library | IVJ |
| Oak Park Public Library | IUO |
| Oakwood Public Library District | MM1 |
| Odell Public Library | ZLZ |
| Odell Public Library District | UO9 |
| O'Fallon Public Library | JP3 |
| Ogden Rose Library | MN0 |
| Oglesby Public Library District | OW4 |
| Ohio Public Library District | OW8 |
| Olmsted Public Library | UZ9 |
| Olney Public Library | IB8 |
| Onarga Community Public Library District | MN1 |
| Oregon Public Library District | LE4 |
| Orland Park Public Library | DYJ |
| Oswego Public Library District | OX2 |
| Palatine Public Library District | JBZ |
| Palestine Public Library District | IB9 |
| Palos Heights Public Library | DZI |
| Palos Park Public Library | DZZ |
| Pankhurst Memorial Library | JX2 |
| Paris Carnegie Public Library | MO0 |
| Park Forest Public Library | JDA |
| Park Ridge Public Library | GO6 |
| Parlin-Ingersoll Library | IEL |
| Patoka Public Library | TFI |
| Paw Paw Public Library District | OX6 |
| Pawnee Public Library | MH# |
| Paxton Carnegie Library | MP0 |
| Pearl City Public Library District | LE5 |
| Pecatonica Public Library District | LE6 |
| Pekin Public Library | IEW |
| Pembroke Township Public Library | I9N |
| Peoria Heights Public Library | IDT |
| Peoria Public Library | IUK |
| Peotone Public Library District | OX9 |
| Peru Public Library | OY2 |
| Petersburg Public Library | IY9 |
| Philo Public Library District | NE0 |
| Pinckneyville Public Library | TIO |
| Piper City Public Library | NE1 |
| Pittsfield Public Library | JGM |
| Plainfield Public Library District | OY4 |
| Plano Community Library District | OY5 |
| Polo Public Library District | LE7 |
| Pontiac Public Library | UP5 |
| Poplar Creek Public Library District | JJG |
| Potomac Public Library | NF0 |
| Prairie Creek Public Library District | UP6 |
| Prairie Trails Public Library District | FJO |
| Prospect Heights Public Library District | JAO |
| Putnam County Public Library District | OZ3 |
| Putnam County Public Library District | OZ4 |
| Putnam County Public Library District | OZ5 |
| Putnam County Public Library District | OZ6 |
| Putnam County Public Library District | OZ7 |
| Putnam County Public Library District | OZ2 |
| Quincy Public Library | IDQ |
| Ramsey Public Library | TKI |
| Ransom Memorial Public Library | JYM |
| Rantoul Public Library | NF1 |
| Raymond A. Sapp Memorial Township Library | QW9 |
| Red Bud Public Library | JP5 |
| Reddick Library | QX9 |
| Richard A. Mautino Memorial Library | QY6 |
| Richton Park Public Library District | FQI |
| Rick Warren Memorial Public Library District | UMO |
| River Forest Public Library | FUI |
| River Grove Public Library District | FUO |
| River Valley District Library | ZNW |
| Riverdale Public Library District | FVI |
| Riverside Public Library | FWI |
| Riverton Village Library | R@V |
| Robert R. Jones Public Library District | ZOV |
| Robert W. Rowe Public Library District | QY8 |
| Robinson Public Library District | IC1 |
| Robinson Public Library District | L$Q |
| Robinson Public Library District | L$R |
| Robinson Public Library District | L$S |
| Rochester Public Library District | IZ2 |
| Rock Falls Public Library District | LB3 |
| Rock Island Public Library | ZPX |
| Rockford Public Library | JBO |
| Rolling Meadows Library | GO7 |
| Roodhouse Public Library | IP3 |
| Roselle Public Library District | JSF |
| Rosiclare Memorial Public Library | TVO |
| Round Lake Area Public Library District | GO8 |
| Roxana Public Library District | IP4 |
| Royalton Public Library District | TYO |
| Rushville Public Library | JGP |
| Salem Township Public Library District | JZW |
| Sallie Logan Public Library | TZI |
| Sandwich District Library | TD3 |
| Savanna Public Library District | LB5 |
| Schaumburg Township District Library | GO9 |
| Schiller Park Public Library | FXO |
| Schmaling Memorial Public Library District | ZQY |
| Selby Township District Library | TD5 |
| Seneca Public Library District | TD7 |
| Sesser Public Library | SQO |
| Shawneetown Public Library | SVO |
| Sheffield Public Library | ZRV |
| Shelbyville Public Library | IZ3 |
| Sheldon Public Library District | NH1 |
| Sherman Public Library District | I8S |
| Sherrard Public Library District | JZQ |
| Shorewood-Troy Public Library District | TE7 |
| Sidell District Library | NJ0 |
| Sidney Community Library | NJ1 |
| Silvis Public Library | ZRW |
| Skokie Public Library | IHG |
| Smithton Public Library District | JP7 |
| Somonauk Public Library District | TF5 |
| South Beloit Public Library | LB7 |
| South County Public Library District | NB1 |
| South Holland Public Library | GFO |
| South Macon Public Library District | NW# |
| South Pekin Public Library | JXU |
| Sparta Public Library | SZI |
| Spoon River Public Library District | JYU |
| Squaw Grove Public Library District | JZ7 |
| St. Elmo Public Library District | IC2 |
| St. Joseph Township-Swearingen Memorial Library | NK1 |
| Staunton Public Library | IP5 |
| Steeleville Area Public Library District | L5D |
| Steeleville Area Public Library District | RLZ |
| Steger-South Chicago Heights Public Library Dist. | GIO |
| Sterling Public Library | LB8 |
| Stickney-Forest View Public Library District | GYI |
| Stinson Memorial Public Library District | L5K |
| Stinson Memorial Public Library District | L5Q |
| Stinson Memorial Public Library District | L5U |
| Stinson Memorial Public Library District | ROZ |
| Stockton Township Public Library | LF2 |
| Stonington Township Public Library | IZ4 |
| Streator Public Library | TF8 |
| Sugar Grove Public Library District | JPK |
| Summit Public Library District | GYO |
| Sumpter Township Library | IZ6 |
| Sun River Terrace District Library | S6$ |
| Sycamore Public Library | LF3 |
| Talcott Free Library District | LB4 |
| Taylorville Public Library | IZ7 |
| Thomas Ford Memorial Library | HAO |
| Thornton Public Library | HDI |
| Three Rivers Public Library District | TG3 |
| Three Rivers Public Library District | TG4 |
| Tinley Park Public Library | HHO |
| Tiskilwa Township Library | TG6 |
| Tolono Public Library District | NL1 |
| Toluca Public Library District | TG7 |
| Toulon Public Library District | ISW |
| Towanda District Library | UP7 |
| Town & Country Public Library District | JVM |
| Tremont District Library | JWX |
| Trenton Public Library | JP8 |
| Tri-Township Public Library District | IP6 |
| Tuscola Public Library | NM0 |
| Twin Rivers District Public Library | ZSV |
| University Park Public Library District | HLI |
| Urbana Free Library | MR0 |
| Utica Public Library District | TH5 |
| Valley District Library | JYV |
| Valmeyer Public Library District | JP9 |
| Vance Township Library | MS0 |
| Venice Public Library | IP7 |
| Vermont Public Library | JZR |
| Vernon Area Public Library District | IV@ |
| Vespasian Warner Public Library District | IZ8 |
| Victoria Public Library District | JZS |
| Vienna Carnegie Public Library | RUO |
| Villa Park Public Library | JOW |
| Village of Avon Public Library | JYP |
| Viola Public Library District | JZT |
| Virginia Public Library | JGR |
| Walnut Public Library District | ZVY |
| Warren County Public Library District | JZU |
| Warren Township Public Library | LF5 |
| Warren-Newport Public Library District | IHZ |
| Warrenville Public Library District | JVZ |
| Warsaw Public Library | JGT |
| Washington District Library | IDW |
| Washington Park Public Library | W#P |
| Watseka Public Library | MT0 |
| Wauconda Area Public Library District | DV1 |
| Waukegan Public Library | GP4 |
| Waverly Public Library | JGV |
| Wayne City Public Library | IC3 |
| Waynesville Township Library | UP8 |
| Weldon Public Library District | IZ9 |
| West Chicago Public Library District | JOV |
| West Frankfort Public Library | RZV |
| West Salem Public Library | IC4 |
| West Sangamon Public Library | N#B |
| West Union District Library | MU0 |
| Westchester Public Library | HMO |
| Western District Library | ZWW |
| Westmont Public Library | HPO |
| Westville Public Library District | MW0 |
| Wheaton Public Library | JAD |
| White Hall Township Library | IP9 |
| White Oak Township Public Library District | UQ3 |
| William Leonard Public Library District | HRO |
| Williamsfield Public Library District | WF6 |
| Williamsville Public Library | ODO |
| Willow Branch Township Library | MW1 |
| Wilmette Public Library District | GP5 |
| Wilmington Public Library District | TH8 |
| Winchester Public Library | JGW |
| Windsor Storm Memorial Public Library District | IZ5 |
| Winfield Public Library | JSI |
| Winnebago Public Library District | LF7 |
| Winnetka-Northfield Public Library District | IWE |
| Witt Township Memorial Library | YW8 |
| Wood Dale Public Library District | JZE |
| Wood River Public Library | IQ2 |
| Woodridge Public Library | HUO |
| Worden Public Library District | YW9 |
| Worth Public Library District | KGI |
| Wyoming Public Library District | ISX |
| Wysox Township Public Library | LD9 |
| York Township Public Library | LF4 |
| Yorkville Public Library | TI2 |
| Zeigler Public Library | RZZ |
| Zion-Benton Public Library District | JAR |
Arranged By Region:
Arranged By Type of Library: