City | 2024 Population |
|---|---|
| Acres Green | 2,417 |
| Aetna Estates | 1,157 |
| Aguilar | 447 |
| Air Force Academy | 6,962 |
| Akron | 1,774 |
| Alamosa | 9,905 |
| Alamosa East | 1,189 |
| Allenspark | 718 |
| Alma | 317 |
| Alpine | 236 |
| Altona | 583 |
| Antonito | 616 |
| Applewood | 7,670 |
| Arapahoe | 23 |
| Arboles | 381 |
| Aristocrat Ranchettes | 1,894 |
| Arriba | 200 |
| Arvada | 120,437 |
| Aspen | 6,483 |
| Aspen Park | 967 |
| Atwood | 133 |
| Ault | 2,912 |
| Aurora | 397,811 |
| Avon | 5,894 |
| Avondale | 265 |