- Geraldine
- Gardiner
- Garrison
- Glasgow
- Gildford
- Glendive
- Grass Range
- Great Falls
- Greycliff
- Gage
- Galata
- Galbraith
- Galen
- Gallatin Gateway
- Gallatin Gateway Inn Park
- Gallup City
- Garland
- Garneill
- Garnet
- Garrett Mobile Home Park
- Garryowen
- Gearing
- Geary
- George Norman Trailer Court
- George Place
- Georgetown
- Gerber
- Geyser
- Gibbtown
- Gibson Flats