Note: To aid in locating libraries, the following listing includes both official and variant names for some libraries.

A
A. Herr Smith & E. E. Smith Loda Township Library
Allerton Public Library, Monticello
Arcola, Illinois Amish Interpretive Center (Affiliate Member)
Arcola Community Unit School District #306
Arcola Public Library District
Armstrong Township High School #225
Arthur Community Unit School District #305
Arthur Public Library District
Asian Educational Media Service (AEMS), Urbana

B
Bement Community Unit School District #5
Bement Public Library District
Bishop O'Rourke Library at the Institute of Catholic Thought, Champaign
Bismarck-Henning Community Unit School District #1
Blue Ridge Township Public Library, Mansfield

C
Camargo Township District Library, Villa Grove
Carle Foundation Hospital Library, Urbana
Casey-Westfield Community Unit School District C-4
Casey Township Library
Catlin Community Unit School District #5
Catlin Public Library District
Central Citizens' Library District, Clifton (Joint School/Public Library with Central CUSD #4)
Central Community Unit School District #4, Clifton
Champaign, High School of Saint Thomas More
Champaign Community Unit 4 Schools
Champaign-Ford Regional Office of Education, Rantoul
Champaign Public Library -- Main Library
Champaign Public Library -- Douglass Branch Library
Charleston Carnegie Public Library
Charleston Community Unit School District #1
Chrisman Public Library
Chrisman, Community Unit School District #6 of Edgar County
Cisco, Willow Branch Township Library
Cissna Park Community Library District (Joint School/Public Library with Cissna Park CUSD #6)
Cissna Park Community Unit School District #6
Clifton, Central Citizens' Library District (Joint School/Public Library with Central CUSD #4)
Clifton, Central Community Unit School District #4
Clifton Public Library
Community Unit School District #6 of Edgar County, Chrisman
Crestwood Community Unit School District #4, Paris

D
Danville, Vermilion County Museum Society (Affiliate Member)
Danville, VA Illiana Health Care System Library
Danville Area Community College Library, Danville
Danville Correctional Center Library, Danville (Developmental Member)
Danville Public Library
DeLand, Goose Creek Township Carnegie Library
DeLand-Weldon Community Unit School District #57
Donovan Community Unit School District #3

E
Early Childhood and Parenting (ECAP) Collaborative, Champaign (Affiliate Member)
Eastern Illinois University-Booth Library, Charleston
Elwood Township Carnegie Library, Ridge Farm

F
Fairmount, Vance Township Library
Fisher Unit 1 School District
Fithian, Oakwood Community Unit School District #76

G
Georgetown Public Library
Giertz Education Center at Krannert Art Museum, Champaign
Gibson City-Melvin-Sibley Community Unit School District #5
Gibson City, Moyer District Library
Gilman-Danforth District Library
Gilman, Iroquois West Community Unit School District #10 (Developmental Member)
Goose Creek Township Carnegie Library, DeLand

H
Heritage Community Unit School District #8, Homer
The High School of Saint Thomas More, Champaign
Homer Community Library
Homer, Heritage Community Unit School District #8
Hoopeston Public Library District
Hume, Shiloh Community Unit School District #1

I
Illinois Amish Interpretive Center, Arcola (Affiliate Member)
Illinois Fire Service Institute Library, Champaign
Illinois Heritage Association (Affiliate Member)
Illinois Natural History Survey Library, Champaign
Illinois State Geological Survey Library, Champaign
Illinois State Water Survey Library, Champaign
Illinois Sustainable Technology Center , Champaign
Iroquois County Community Unit School District #9, Watseka
Iroquois West Community Unit School District #10, Gilman (Developmental Member)

J
Jamaica Community Unit School District #12, Sidell

K
Kansas Community Memorial Library
Kansas Community Unit School District #3

L
Lake Land College Library, Mattoon
Lakeview College of Nursing Library, Danville
Loda, A. Herr Smith & E. E. Smith Loda Township Library

M
Mahomet Public Library District
Mahomet-Seymour Community Unit School District #3
Mansfield, Blue Ridge Township Public Library
Marshall Area Public Library District (Contracts for service with Marshall Public Library)
Marshall Community Unit School District #C-2
Marshall Public Library
Martinsville Public Library District
Martinsville Unit School District #C-3
Mattoon, Sarah Bush Lincoln Health Center Medical Library
Mattoon Community Unit School District #2
Mattoon Public Library
Melvin Public Library
Milford Community Consolidated School District #280
Milford District Library
Monticello, Allerton Public Library
Monticello, Piatt County Museum (Affiliate Member)
Monticello Community Unit School District #25
Moyer District Library, Gibson City

N
National Council of Teachers of English (NCTE), Urbana (Affiliate Member)
Newman Regional Library District

O
Oakland Community Unit School District #5
Oakwood Community Unit School District #76, Fithian
Oakwood Public Library District
Ogden Rose Public Library
Onarga Community Public Library District

P
Paris Carnegie Public Library
Paris, Crestwood Community Unit School District #4
Paris Union School District #95
Parkland College Library, Champaign
Paxton Carnegie Library
Paxton-Buckley-Loda Unit #10
Philo Public Library District
Piatt County Museum, Monticello (Affiliate Member)
Piper City Public Library District
Potomac Public Library
Provena Covenant Medical Center Library, Urbana
Provena United Samaritan's Medical Center Library, Danville

R
Rantoul Public Library
Rantoul Township High School
The Reading Group (Affiliate Member)
Ridge Farm, Elwood Township Carnegie Library

S
St. Joseph Community Consolidated School, District #169
St. Joseph-Ogden High School District #305
St. Joseph Township Swearingen Memorial Library
Sarah Bush Lincoln Health Center Medical Library, Mattoon
Sheldon Public Library District
Shiloh Community Unit School District #1, Hume
Sidell District Library
Sidell, Jamaica Community Unit School District #12
Sidney Community Library

T
Tolono Public Library District
Tolono Unit 7 School District
Tuscola Public Library
Tuscola School District #301

U
U.S. Army Engineer Research and Development Center (ERDC) Library, Champaign
University of Illinois Extension (Affiliate Member)
University of Illinois Library, Urbana
University of Illinois at Chicago Library of the Health Sciences, Urbana
Urbana Free Library
Urbana School District #116

V
Vance Township Library, Fairmount
VA Illiana Health Care System Library, Danville
Vermilion County Museum Society, Danville (Affiliate Member)
Villa Grove, Camargo Township District Library
Villa Grove CUSD #302

W
Watseka Public Library
West Union District Library
Westville Community Unit School District #2
Westville Public Library District
Willow Branch Township Library, Cisco
Watseka, Iroquois County Community Unit School District #9
WEIU TV / Eastern Illinois University (Affiliate Member)
WILL-AM-FM-TV (Affiliate Member)