G
- Galatea
- Galena
- Galeton
- Galien
- Garcia
- Garden City
- Gardner
- Garfield
- Garo
- Gary
- Gaskil
- Gates
- Gateway
- Gateway
- Gem Village
- Genesee
- Genoa
- Georgetown
- Gerrard
- Giddings
- Gilcrest
- Gill
- Gillett
- Gilman
- Gilpin
- Gilpin
- Gilsonite
- Glade Park
- Gladstone
- Glen Comfort
- Glen Cove
- Glendale
- Glendevey
- Gleneagle
- Glenelk
- Glen Eyrie
- Glen Haven
- Glenisle
- Glentivar
- Glenwood Springs
- Golconda
- Golden
- Goldfield
- Gold Hill
- Goodale
- Goodell Corner
- Gooding
- Goodnight
- Good Pasture
- Goodrich
- Gothic
- Gould
- Gowanda
- Graft
- Granada
- Granby
- Grand Junction
- Grand Lake
- Grand Mesa
- Grand Valley
- Grandview Estates
- Granger
- Granite
- Grant
- Graymont
- Great Divide
- Greeley
- Greeley Junction
- Greeley Spanish Colony
- Greenhorn
- Greenland
- Green Mountain Falls
- Green Settlement
- Green Valley Acres
- Greenwood
- Greenwood
- Greenwood Village
- Greystone
- Griff
- Grover
- Guadalupe
- Guffey
- Gulnare
- Gunbarrel
- Gun Club Estates
- Gunnison
- Guston
- Gypsum