- Gages Lake (Population: 10,415)
- Galatia (Population: 1,013)
- Galena (Population: 3,460)
- Galesburg (Population: 33,706)
- Galva (Population: 2,758)
- Gardner (Population: 1,406)
- Geneseo (Population: 6,480)
- Geneva (Population: 19,515)
- Genoa (Population: 4,169)
- Georgetown (Population: 3,628)
- Germantown Hills (Population: 2,111)
- Germantown (Population: 1,118)
- Gibson (Population: 3,373)
- Gilberts (Population: 1,279)
- Gillespie (Population: 3,412)
- Gilman (Population: 1,793)
- Girard (Population: 2,245)
- Glasford (Population: 1,076)
- Glen Carbon (Population: 10,425)
- Glen Ellyn (Population: 26,999)
- Glencoe (Population: 8,762)
- Glendale Heights (Population: 31,765)
- Glenview (Population: 41,847)
- Glenwood (Population: 9,000)
- Godfrey (Population: 16,286)
- Goodings Grove (Population: 17,084)
- Grandview (Population: 1,537)
- Grandwood Park (Population: 4,521)
- Granite City (Population: 31,301)
- Grant Park (Population: 1,358)
- Granville (Population: 1,414)
- Grayslake (Population: 18,506)
- Grayville (Population: 1,725)
- Green Oaks (Population: 3,572)
- Greenfield (Population: 1,179)
- Greenup (Population: 1,532)
- Greenville (Population: 6,955)
- Gridley (Population: 1,411)
- Griggsville (Population: 1,258)
- Gurnee (Population: 28,834)
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