| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Gage | city | Montana | United States | 46.48 | -108.39 | 3349 | |
| Galata | city | Montana | United States | 48.48 | -111.35 | 3349 | |
| Galbraith | city | Montana | United States | 46.60 | -107.48 | 3349 | |
| Galen | city | Montana | United States | 46.24 | -112.78 | 5029 | |
| Gallatin (historical) | city | Montana | United States | 45.93 | -111.50 | 4189 | |
| Gallatin Gateway | city | Montana | United States | 45.59 | -111.20 | 5029 | |
| Gallatin Gateway Inn Park | city | Montana | United States | 45.59 | -111.20 | 5029 | |
| Gallop (historical) | city | Montana | United States | 45.98 | -111.10 | 5213 | |
| Gallup City | city | Montana | United States | 48.09 | -112.11 | 4189 | |
| Gardiner | city | Montana | United States | 45.03 | -110.71 | 5400 | |
| Garland | city | Montana | United States | 46.05 | -105.93 | 2677 | |
| Garneill | city | Montana | United States | 46.75 | -109.75 | 4452 | |
| Garnet | city | Montana | United States | 46.83 | -113.34 | 5957 | |
| Garnet Ghost Town | city | Montana | United States | 46.83 | -113.34 | 5957 | |
| Garrett Mobile Home Park | city | Montana | United States | 47.51 | -111.35 | 3398 | |
| Garrison | city | Montana | United States | 46.52 | -112.81 | 4324 | |
| Garrison (historical) | city | Montana | United States | 47.38 | -111.56 | 3395 | |
| Garryowen | city | Montana | United States | 45.53 | -107.42 | 3349 | |
| Gateway (historical) | city | Montana | United States | 49.00 | -115.17 | 2509 | |
| Gauglersville (historical) | city | Montana | United States | 46.49 | -110.28 | 5029 | |
| Gearing | city | Montana | United States | 46.71 | -112.13 | 4189 | |
| Geary | city | Montana | United States | 47.03 | -113.02 | 4199 | |
| Geduhn (historical) | city | Montana | United States | 48.63 | -113.86 | 3349 | |
| Genevieve (historical) | city | Montana | United States | 48.73 | -107.16 | 2509 | |
| Genou (historical) | city | Montana | United States | 48.00 | -111.26 | 3385 | |
| George (historical) | city | Montana | United States | 48.33 | -110.94 | 3349 | |
| George Norman Trailer Court | city | Montana | United States | 45.25 | -111.25 | 6197 | |
| George Place | city | Montana | United States | 45.36 | -109.50 | 5062 | |
| George Place (historical) | city | Montana | United States | 45.36 | -109.52 | 5200 | |
| Georgetown | city | Montana | United States | 46.20 | -113.25 | 6709 | |
| Geraldine | city | Montana | United States | 47.60 | -110.27 | 3349 | |
| Gerber | city | Montana | United States | 47.45 | -111.16 | 3398 | |
| Geyser | city | Montana | United States | 47.26 | -110.49 | 4199 | |
| Geyser Trailer Park | city | Montana | United States | 45.66 | -110.56 | 4501 | |
| Gibbtown | city | Montana | United States | 46.41 | -108.56 | 3398 | |
| Gibson Flats | city | Montana | United States | 47.47 | -111.25 | 3398 | |
| Giffen | city | Montana | United States | 47.31 | -111.19 | 4189 | |
| Gildford | city | Montana | United States | 48.57 | -110.30 | 2824 | |
| Gildford Colony | city | Montana | United States | 48.79 | -110.27 | 2798 | |
| Gilman | city | Montana | United States | 47.51 | -112.37 | 4189 | |
| Gilroy | city | Montana | United States | 45.66 | -111.16 | 5029 | |
| Giltedge | city | Montana | United States | 47.13 | -109.20 | 4475 | |
| Girard | city | Montana | United States | 47.87 | -104.42 | 2509 | |
| Gird Point | city | Montana | United States | 46.21 | -113.91 | 6948 | |
| Glacier Colony | city | Montana | United States | 48.83 | -112.22 | 4189 | |
| Glasgow | city | Montana | United States | 48.20 | -106.64 | 2509 | |
| Glastonbury | city | Montana | United States | 45.33 | -110.78 | 5029 | |
| Glastonbury Census Designated Place | city | Montana | United States | 45.33 | -110.78 | 5029 | |
| Glen | city | Montana | United States | 45.48 | -112.69 | 5029 | |
| Glenbeg (historical) | city | Montana | United States | 46.37 | -112.15 | 6709 | |
| Glendale | city | Montana | United States | 45.64 | -112.77 | 5869 | |
| Glendale Colony | city | Montana | United States | 48.84 | -112.55 | 4189 | |
| Glendive | city | Montana | United States | 47.11 | -104.71 | 2083 | |
| Glengarry | city | Montana | United States | 47.03 | -109.55 | 4189 | |
| Glentana | city | Montana | United States | 48.85 | -106.25 | 3349 | |
| Gloss Place | city | Montana | United States | 45.36 | -113.27 | 6998 | |
| Gloster | city | Montana | United States | 46.76 | -112.34 | 5948 | |
| Gold Butte | city | Montana | United States | 48.87 | -111.39 | 5029 | |
| Gold Coin (historical) | city | Montana | United States | 46.17 | -113.24 | 6709 | |
| Goldcreek | city | Montana | United States | 46.59 | -112.93 | 4209 | |
| Golden (historical) | city | Montana | United States | 45.22 | -108.97 | 3759 | |
| Golden Age Village Trailer Park | city | Montana | United States | 45.37 | -110.73 | 5029 | |
| Golden Ridge | city | Montana | United States | 47.57 | -112.23 | 4202 | |
| Golden Valley Colony | city | Montana | United States | 46.26 | -109.27 | 4189 | |
| Goldstone | city | Montana | United States | 48.90 | -110.53 | 3349 | |
| Golf Bench (historical) | city | Montana | United States | 47.83 | -109.50 | 3349 | |
| Gopher (historical) | city | Montana | United States | 45.22 | -106.30 | 4189 | |
| Gordon | city | Montana | United States | 47.63 | -111.65 | 3599 | |
| Gorus | city | Montana | United States | 46.06 | -114.17 | 4189 | |
| Grace | city | Montana | United States | 45.81 | -112.33 | 5869 | |
| Grahams Place | city | Montana | United States | 44.86 | -111.58 | 6043 | |
| Granite | city | Montana | United States | 46.32 | -113.24 | 7549 | |
| Grannis | city | Montana | United States | 45.76 | -110.50 | 4550 | |
| Grant | city | Montana | United States | 45.01 | -113.07 | 5869 | |
| Grant Creek (historical) | city | Montana | United States | 46.96 | -114.01 | 4189 | |
| Grantsdale | city | Montana | United States | 46.20 | -114.14 | 4189 | |
| Grass Range | city | Montana | United States | 47.03 | -108.80 | 3559 | |
| Grass Valley | city | Montana | United States | 46.94 | -114.14 | 3349 | |
| Grayling | city | Montana | United States | 45.05 | -112.82 | 5383 | |
| Grayling | city | Montana | United States | 44.81 | -111.19 | 6709 | |
| Great Falls | city | Montana | United States | 47.50 | -111.30 | 3398 | |
| Green Acres | city | Montana | United States | 48.40 | -115.57 | 2509 | |
| Green Acres Addition | city | Montana | United States | 45.66 | -110.56 | 4501 | |
| Green Field Mobile Home Park | city | Montana | United States | 46.88 | -114.08 | 3349 | |
| Green Star Trailer Court | city | Montana | United States | 46.41 | -105.82 | 2509 | |
| Greenfield | city | Montana | United States | 47.64 | -111.86 | 4189 | |
| Greenland Park Trailer Court | city | Montana | United States | 46.88 | -113.89 | 3349 | |
| Greenough | city | Montana | United States | 46.92 | -113.44 | 4189 | |
| Greenwood | city | Montana | United States | 45.68 | -111.21 | 5029 | |
| Gregson | city | Montana | United States | 46.05 | -112.81 | 5111 | |
| Greve (historical) | city | Montana | United States | 48.97 | -107.42 | 2782 | |
| Greycliff | city | Montana | United States | 45.76 | -109.78 | 4189 | |
| Grisdella (historical) | city | Montana | United States | 46.99 | -106.96 | 3349 | |
| Groveland | city | Montana | United States | 46.44 | -110.40 | 5062 | |
| Gunsight | city | Montana | United States | 48.64 | -112.46 | 4189 | |
| Guntner Place | city | Montana | United States | 45.19 | -112.47 | 5869 |