Places beginning with GA in Illinois, United States
- Gage Park (subdivision)
- Gages Lake
- Galatia
- Galatia, Township of
- Gale
- Galena
- Galena Junction
- Galesburg
- Galesburg City, Township of
- Galesburg, Township of
- Galesville
- Galewood (subdivision)
- Gallagher
- Gallatin County
- Galt
- Galton
- Galva
- Galva, Township of
- Ganeer, Township of
- Ganntown
- Gano (subdivision)
- Garber
- Gard
- Gardena
- Garden Heights
- Garden Hill, Township of
- Garden Homes (subdivision)
- Garden of Eden
- Garden Plain
- Garden Plain, Township of
- Garden Prairie
- Gardner
- Gardner, Township of
- Gards Point
- Garfield
- Garfield Manor (subdivision)
- Garfields (subdivision)
- Garfield, Township of
- Garibaldi Square (subdivision)
- Garland
- Garnerville
- Garrett
- Garrett, Township of
- Garrison
- Gartside
- Gary
- Gaskins City
- Gaslight Village
- Gays