27 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Greeley | Weld County | 115,631 |
| Grand Junction | Mesa County | 71,752 |
| Golden | Jefferson County | 20,089 |
| Greenwood Village | Arapahoe County | 15,199 |
| Glenwood Springs | Garfield County | 10,386 |
| Gunbarrel | Boulder County | 10,319 |
| Gypsum | Eagle County | 9,498 |
| Gunnison | Gunnison County | 6,882 |
| Gleneagle | El Paso County | 6,374 |
| Glendale | Arapahoe County | 4,431 |
| Genesee | Jefferson County | 4,155 |
| Granby | Grand County | 2,360 |
| Georgetown | Clear Creek County | 1,290 |
| Gilcrest | Weld County | 1,015 |
| Grand View Estates | Douglas County | 853 |
| Green Mountain Falls | El Paso County | 598 |
| Granada | Prowers County | 447 |
| Grand Lake | Grand County | 398 |
| Gerrard | Mineral County | 337 |
| Gold Hill | Boulder County | 254 |
| Garden City | Weld County | 249 |
| Goldfield | Teller County | 208 |
| Genoa | Lincoln County | 154 |
| Grover | Weld County | 151 |
| Glendale | Boulder County | 85 |
| Gardner | Huerfano County | 71 |
| Guffey | Park County | 36 |