45 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hartford | 1 | 122,544 | 120,469 | 0.34% | 7,051 | 17 | City |
| New Britain | 2 | 76,603 | 72,943 | 0.96% | 5,718 | 13 | City |
| West Hartford | 3 | 64,462 | 63,118 | 0.43% | 2,952 | 22 | Township |
| West Hartford | 4 | 64,293 | 63,023 | 0.11% | 2,944 | 22 | CDP |
| Manchester | 5 | 60,201 | 59,500 | 0.42% | 2,195 | 27 | Township |
| East Hartford | 6 | 51,323 | 50,877 | 0.38% | 2,850 | 18 | Township |
| East Hartford | 7 | 50,864 | 50,036 | -0.05% | 2,825 | 18 | CDP |
| Southington | 8 | 44,459 | 43,431 | 0.59% | 1,239 | 36 | Township |
| Enfield | 9 | 41,282 | 41,185 | 0.35% | 1,239 | 33 | Township |
| Manchester | 10 | 38,624 | 35,946 | 1.41% | 4,182 | 9 | CDP |
| Glastonbury | 11 | 35,727 | 35,065 | 0.49% | 697 | 51 | Township |
| Newington | 12 | 31,827 | 30,425 | 0.43% | 2,422 | 13 | Township |
| Vernon | 13 | 31,034 | 30,168 | 0.45% | 1,752 | 18 | Township |
| Newington | 14 | 30,432 | 30,114 | -0.03% | 2,316 | 13 | CDP |
| Windsor | 15 | 29,765 | 29,341 | 0.36% | 1,008 | 30 | Township |
| Farmington | 16 | 28,983 | 26,635 | 2.82% | 1,039 | 28 | Township |
| Mansfield | 17 | 28,953 | 19,446 | 3.42% | 649 | 45 | Township |
| Wethersfield | 18 | 27,481 | 27,242 | 0.4% | 2,234 | 12 | Township |
| Wethersfield | 19 | 27,323 | 26,068 | 0.16% | 2,221 | 12 | CDP |
| South Windsor | 20 | 27,207 | 26,868 | 0.54% | 970 | 28 | Township |
| Simsbury | 21 | 25,459 | 24,499 | 0.42% | 750 | 34 | Township |
| Bloomfield | 22 | 22,367 | 21,447 | 0.76% | 857 | 26 | Township |
| Rocky Hill | 23 | 21,916 | 20,755 | 2.54% | 1,628 | 13 | Township |
| Berlin | 24 | 20,750 | 20,134 | 0.5% | 789 | 26 | Township |
| Avon | 25 | 19,215 | 18,875 | 0.57% | 830 | 23 | Township |
| Plainville | 26 | 17,912 | 17,457 | 0.87% | 1,845 | 10 | Township |
| Ellington | 27 | 16,673 | 16,388 | 0.53% | 490 | 34 | Township |
| Suffield | 28 | 16,198 | 15,684 | 1.47% | 383 | 42 | Township |
| Tolland | 29 | 14,823 | 14,530 | 0.57% | 374 | 40 | Township |
| Windsor Locks | 30 | 12,689 | 12,577 | 0.36% | 1,406 | 9 | Township |
| Windsor Locks | 31 | 12,579 | 12,732 | 0.04% | 1,394 | 9 | CDP |
| Coventry | 32 | 12,520 | 12,220 | 0.6% | 333 | 38 | Township |
| Granby | 33 | 12,208 | 10,890 | 3.89% | 300 | 41 | Township |
| Stafford | 34 | 11,743 | 11,414 | 0.44% | 202 | 58 | Township |
| East Windsor | 35 | 11,369 | 11,148 | 0.6% | 433 | 26 | Township |
| Somers | 36 | 11,041 | 10,080 | 1.25% | 388 | 28 | Township |
| Canton | 37 | 10,346 | 10,086 | 0.71% | 421 | 25 | Township |
| Hebron | 38 | 9,319 | 9,071 | 0.7% | 253 | 37 | Township |
| Marlborough | 39 | 6,228 | 6,102 | 0.58% | 267 | 23 | Township |
| Willington | 40 | 5,638 | 5,552 | 0.52% | 169 | 33 | Township |
| Columbia | 41 | 5,381 | 5,266 | 0.41% | 252 | 21 | Township |
| East Granby | 42 | 5,310 | 5,208 | 0.61% | 303 | 18 | Township |
| Bolton | 43 | 4,930 | 4,846 | 0.72% | 342 | 14 | Township |
| Andover | 44 | 3,194 | 3,146 | 0.54% | 207 | 15 | Township |
| Somers | 45 | 2,342 | 2,343 | 1.61% | 957 | 2 | CDP |
Hartford is the largest city in Capitol Planning Region, with a population of 122,544.
Somers is the smallest city in Capitol Planning Region, with a population of 2,342.
There are 45 cities in Capitol Planning Region, Connecticut.