City | 2024 Population |
|---|---|
| Acres Green | 2,417 |
| Aetna Estates | 1,157 |
| Aguilar | 453 |
| Air Force Academy | 6,962 |
| Akron | 1,752 |
| Alamosa | 9,879 |
| Alamosa East | 1,189 |
| Allenspark | 718 |
| Alma | 321 |
| Alpine | 236 |
| Altona | 583 |
| Antonito | 625 |
| Applewood | 7,670 |
| Arapahoe | 23 |
| Arboles | 381 |
| Aristocrat Ranchettes | 1,894 |
| Arriba | 199 |
| Arvada | 118,768 |
| Aspen | 6,487 |
| Aspen Park | 967 |
| Atwood | 133 |
| Ault | 3,065 |
| Aurora | 400,325 |
| Avon | 5,707 |
| Avondale | 265 |