29 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Denver | 1 | 715,891 | 717,606 | -0.05% | 4,677 | 153.07 | City |
| Aurora | 2 | 400,571 | 386,773 | 0.69% | 2,457 | 163.01 | City |
| Thornton | 3 | 146,746 | 142,185 | 0.63% | 4,020 | 36.50 | City |
| Westminster | 4 | 113,729 | 116,594 | -0.5% | 3,597 | 31.62 | City |
| Commerce City | 5 | 71,887 | 62,782 | 2.6% | 1,968 | 36.53 | City |
| Brighton | 6 | 43,933 | 40,293 | 1.68% | 2,050 | 21.43 | City |
| Northglenn | 7 | 38,249 | 38,036 | 0.11% | 5,197 | 7.36 | City |
| Sherrelwood | 8 | 19,496 | 19,082 | 0.42% | 7,948 | 2.45 | CDP |
| Welby | 9 | 16,647 | 15,372 | 0.73% | 4,494 | 3.70 | CDP |
| Federal Heights | 10 | 13,642 | 14,394 | -1.09% | 7,686 | 1.77 | City |
| Berkley | 11 | 11,179 | 11,299 | -0.02% | 3,108 | 3.60 | CDP |
| Fairmount | 12 | 11,108 | 9,549 | 2.18% | 1,827 | 6.08 | CDP |
| Derby | 13 | 9,340 | 9,156 | 1.19% | 5,337 | 1.75 | CDP |
| Lochbuie | 14 | 8,425 | 8,202 | 0.54% | 2,286 | 3.69 | Town |
| Shaw Heights | 15 | 5,544 | 5,987 | 0.53% | 8,201 | 0.68 | CDP |
| Todd Creek | 16 | 5,379 | 4,635 | 2.03% | 544 | 9.89 | CDP |
| Bennett | 17 | 3,979 | 2,904 | 5.71% | 576 | 6.90 | Town |
| Strasburg | 18 | 3,324 | 2,987 | 1.78% | 160 | 20.80 | CDP |
| Watkins | 19 | 1,239 | 746 | 7.18% | 50 | 24.75 | CDP |
| Comanche Creek | 20 | 570 | 426 | 2.33% | 26 | 21.69 | CDP |
| Mountain View | 21 | 507 | 537 | -1.17% | 5,452 | 0.09 | Town |
| Morgan Heights | 22 | 295 | 227 | 0.68% | 1,035 | 0.28 | CDP |
| North Washington | 23 | 169 | 663 | -11.05% | 33 | 5.20 | CDP |
| Blue Sky | 24 | 123 | 98 | 7.89% | 3,417 | 0.04 | CDP |
| Trail Side | 25 | 104 | 138 | 7.22% | 145 | 0.72 | CDP |
| Brick Center | 26 | 83 | 134 | -2.35% | 14 | 5.78 | CDP |
| Saddle Ridge | 27 | 66 | 51 | 6.45% | 379 | 0.17 | CDP |
| Peoria | 28 | 52 | 91 | -11.86% | 4 | 13.77 | CDP |
| Lakeside | 29 | 15 | 17 | 0% | 80 | 0.19 | Town |
Denver is the largest city in Adams County, with a population of 715,891.
Lakeside is the smallest city in Adams County.
There are 29 cities in Adams County, Colorado.