G
- Gages Lake
- Galatia
- Gale
- Galena
- Galesburg
- Galesville
- Gallagher
- Galt
- Galton
- Galva
- Ganntown
- Garber
- Gard
- Garden Plain
- Garden Prairie
- Gardner
- Gards Point
- Garfield
- Garland
- Garnerville
- Garrett
- Garrison
- Gaskins City
- Gays
- Gears Ferry
- Geff
- Geneseo
- Geneva
- Genoa
- Georgetown
- Georgetown
- Gerlaw
- German Corner
- Germantown
- Germantown Hills
- German Valley
- Giblin
- Gibson City
- Gibsonia
- Gifford
- Gila
- Gilberts
- Gilbirds
- Gilchrist
- Gilchrist
- Gilead
- Gillespie
- Gilletts
- Gillum
- Gilman
- Gilmore
- Gilmore
- Gilson
- Ginger Hill
- Gingle Corners
- Girard
- Gladstone
- Glasford
- Glasgow
- Glenarm
- Glen Avon
- Glenbard South
- Glenburn
- Glen Carbon
- Glen Carbon Crossing
- Glencoe
- Glendale
- Glendale Heights
- Glen Ellyn
- Glenn
- Glenview
- Glenwood
- Glover
- Goatsburg
- Godfrey
- Godley
- Goeselville
- Golconda
- Golden
- Golden Eagle
- Golden Gate
- Golden Lily
- Golf
- Goodenow
- Goode Subdivision
- Goodfield
- Good Hope
- Goodings Grove
- Goodrich
- Goodwine
- Goofy Ridge
- Gordon
- Goreville
- Gorham
- Gorman
- Gossett
- Gowens
- Grafton
- Grand Chain
- Grand Detour
- Grand Pass
- Grand Ridge
- Grand Tower
- Grandview
- Grandview
- Grandwood Park
- Graney
- Grange Hall
- Grange Hall
- Granite City
- Grantfork
- Grant Park
- Grant Park
- Grantsburg
- Grant Village
- Granville
- Grape Creek
- Graymont
- Graymoor
- Grays Corner
- Grayslake
- Grayson
- Grayville
- Green Acres
- Greenbriar
- Green Brier
- Greenbush
- Green Creek
- Greendale
- Greenfield
- Greenoak
- Green Oaks
- Greenpond
- Green Ridge
- Green River
- Green Rock
- Greenup
- Green Valley
- Greenview
- Greenville
- Greenwich
- Greenwood
- Greer
- Gretna
- Gridley
- Griffin
- Grigg
- Griggsville
- Grimes
- Grimsby
- Grinnell
- Griswold
- Groat
- Gross
- Grove City
- Groveland
- Grubbs
- Grumle Corner
- Guilford
- Gulf Port
- Gurnee
- Gurney
- Guthrie