- Gage Park
- Gages Lake
- Galatia
- Galena
- Galesburg
- Galva
- Garden Prairie
- Gardner
- Garrett
- Gays
- Geff
- Geneseo
- Geneva
- Genoa
- Georgetown
- Georgetown
- Georgetown
- German Valley
- Germantown
- Germantown Hills
- Gibson City
- Gifford
- Gilberts
- Gillespie
- Gilman
- Gilson
- Girard
- Gladstone
- Glasford
- Glasgow
- Glen Carbon
- Glen Ellyn
- Glencoe
- Glendale Heights
- Glenview
- Glenwood
- Godfrey
- Godley
- Golconda
- Golden
- Golden Gate
- Golf
- Good Hope
- Goodfield
- Goodings Grove
- Goofy Ridge
- Goreville
- Gorham
- Grafton
- Grand Boulevard
- Grand Chain
- Grand Detour
- Grand Ridge
- Grand Tower
- Grandview
- Grandwood Park
- Granite City
- Grant Park
- Grantfork
- Granville
- Grayslake
- Grayville
- Greater Grand Crossing
- Green Oaks
- Green Rock
- Green Valley
- Greenfield
- Greenup
- Greenview
- Greenville
- Greenwood
- Gridley
- Griggsville
- Gulfport
- Gurnee
