- Glenmore Park
- Gaither
- Gaither Farm Estates
- Gaither Heights
- Gaither Manor
- Gaithersburg
- Galena
- Galestown
- Galesville
- Galesville Estates
- Gallagher Estates
- Gallagher Park
- Gallant Acres
- Gallant Green Woods
- Gallions Corner
- Galt
- Gambage Island
- Gamber
- Gambrill South
- Gambrills
- Gannon
- Gapgalleon
- Gapland
- Garden Estates
- Garden Village Park
- Gardenspot
- Gardenville
- Garfield
- Garfield Manor
- Garland