Illinois Schools
- Joliet West High School
- Jones College Prep High School
- Jones Fine And Performing Arts Residential College
- Josephinum Academy
- Judah Christian School
- Judson College
- Judson University
- Julian High School
- Kipp Chicago Schools
- Kaneland High School
- Kankakee Community College
- Kankakee High School
- Kaskaskia College
- Keeneyville School District 20
- Keith Country Day School
- Kellogg School Of Management
- Kelvyn Park High School
- Kendall College
- Kennedy–king College
- Kenwood Academy
- Kewanee High School
- Kildeer Countryside Community Consolidated School District 96
- King College Prep High School
- Kishwaukee College
- Knowledge Systems Institute
- Knox College
- Knoxville High School
- La Moille High School
- Lagrange Elementary School District 102
- Lagrange Highlands School District 106
- Lasalle Elementary School District 122
- Lasalle Peru High School
- Lake Bluff Elementary School District 65
- Lake Forest Academy
- Lake Forest College
- Lake Forest Country Day School
- Lake Forest Graduate School Of Management
- Lake Forest High School
- Lake Forest School District 67
- Lake Land College
- Lake Park High School
- Lake View High School
- Lake Villa Community Consolidated School District 41
- Lake Zurich High School
- Lakes Community High School
- Lakeview College Of Nursing
- Lakeview Jr High School
- Lane Technical College Prep High School
- Lanphier High School
- Larkin High School
- Las Casas Occupational High School
- Latin School Of Chicago
- Latino Youth High School
- Lawrenceville High School
- Lebanon High School
- Leland High School
- Lemont High School
- Lena Winslow High School
- Lenart Regional Gifted Center
- Leo Catholic High School
- Lewis College Of Science And Letters
- Lewis Elementary School
- Lewis University
- Lewis And Clark Community College
- Lewistown High School
- Lexington College
- Lexington Community Unit School District 7
- Lexington High School
- Leyden High School District 212
- Liautaud Graduate School Of Business
- Liberty Community Unit School District 2
- Liberty High School
- Libertyville District 70
- Libertyville High School
- Limestone Community High School District 310
- Lincoln Christian University
- Lincoln College
- Lincoln Community High School
- Lincoln Junior College
- Lincoln Land Community College
- Lincoln Park High School
- Lincoln School
- Lincoln Trail College
- Lincoln Way Central High School
- Lincoln Way Community High School District
- Lincoln Way East High School
- Lincoln Way North High School
- Lincoln Way West High School
- Lincolnshire Prairie View School District 103
- Lincolnwood High School
- Lindenwood University–belleville
- Lionel Hampton Fine & Performing Arts School
- Lisle Community Unit School District 202
- Lisle High School
- Litchfield High School
- Little Angels Early Childhood Center
- Little Village Lawndale High School Campus
- Lockport Township High School
- Logan Junior High School
- Lone Tree School