| Name |
County |
| Gibson City - Melvin - Sibley High School |
Ford County |
| Gifford Street High School |
Kane County |
| Gillespie High School |
Macoupin County |
| Glenbard East High School |
DuPage County |
| Glenbard North High School |
DuPage County |
| Glenbard South High School |
DuPage County |
| Glenbard West High School |
DuPage County |
| Glenbrook Evening High School |
Cook County |
| Glenbrook North High School |
Cook County |
| Glenbrook South High School |
Cook County |
| Glenwood High School |
Sangamon County |
| Golder College Prep |
Cook County |
| Goreville High School |
Johnson County |
| Granite City High School |
Madison County |
| Grant Community High School |
Lake County |
| Grant Park High School |
Kankakee County |
| Grayslake Central High School |
Lake County |
| Grayslake North High School |
Lake County |
| Greater Lawndale High School For Social Justice |
Cook County |
| Greenfield Community High School |
Greene County |
| Griggsville Perry High School |
Pike County |
| Guerin College Preparatory High School |
Cook County |
| Guilford High School |
Winnebago County |
| Hales Franciscan High School |
Cook County |
| Hall High School |
Bureau County |
| Hampshire High School |
Kane County |
| Hanna Sacks Bais Yaakov High School |
Cook County |
| Hardin County High School |
Hardin County |
| Harlem High School |
Winnebago County |
| Harold L Richards High School |
Cook County |
| Harrisburg High School |
Saline County |
| Harry D Jacobs High School |
McHenry County |
| Harvard High School |
McHenry County |
| Havana High School |
Mason County |
| Henry - Senachwine High School |
Marshall County |
| Heritage High School |
Champaign County |
| Herrin High School |
Williamson County |
| Herscher High School |
Kankakee County |
| Highland High School |
Madison County |
| Highland Park High School |
Lake County |
| Hillcrest High School |
Cook County |
| Hillsboro High School |
Montgomery County |
| Hinckley - Big Rock High School |
DeKalb County |
| Hinsdale Central High School |
DuPage County |
| Hinsdale South High School |
DuPage County |
| Hirsch Metropolitan High School |
Cook County |
| Hoffman Estates High School |
Cook County |
| Holy Trinity High School |
Cook County |
| Homewood - Flossmoor High School |
Cook County |
| Hononegah Community High School |
Winnebago County |
| Hoopeston Area High School |
Vermilion County |
| Hubbard High School |
Cook County |
| Huntley High School |
McHenry County |
| Hutsonville High School |
Crawford County |
| Hyde Park Academy High School |
Cook County |
| IC Catholic Prep School |
DuPage County |
| Illini Bluffs High School |
Peoria County |
| Illini West High School |
Hancock County |
| Illinois Lutheran High School and Junior High School |
Will County |
| Illinois Mathematics and Science Academy |
Kane County |
| Illinois Valley Central High School |
Peoria County |
| Illinois Youth Center Murphysboro |
Jackson County |
| Indian Creek High School |
DeKalb County |
| Infinity Math Science and Technology High School |
Cook County |
| Iroquois West High School |
Iroquois County |
| Jacksonville High School |
Morgan County |
| Jefferson High School |
Winnebago County |
| Jersey Community High School |
Jersey County |
| John F Kennedy High School |
Cook County |
| John Hancock College Preparatory High School |
Cook County |
| John Hersey High School |
Cook County |
| John Hope Community Academy High School |
Cook County |
| John Marshall Metropolitan High School |
Cook County |
| Johnsburg High School |
McHenry County |
| Johnston City High School |
Williamson County |
