Identifiers: city · community · borough · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | New Haven (city), CT | 134,023 |
| 2 | Hartford (city), CT | 121,054 |
| 3 | Waterbury (city), CT | 114,403 |
| 4 | New Britain (city), CT | 74,135 |
| 5 | Meriden (city), CT | 60,850 |
| 6 | Bristol (city), CT | 60,833 |
| 7 | West Haven (city), CT | 55,584 |
| 8 | Milford city (balance) (community), CT | 50,558 |
| 9 | Middletown (city), CT | 47,717 |
| 10 | Naugatuck (borough), CT | 31,519 |
| 11 | Newington (CDP), CT | 30,536 |
| 12 | East Haven (CDP), CT | 27,923 |
| 13 | Wethersfield (CDP), CT | 27,298 |
| 14 | North Haven (CDP), CT | 24,253 |
| 15 | Ansonia (city), CT | 18,918 |
| 16 | Wallingford Center (CDP), CT | 18,278 |
| 17 | Orange (CDP), CT | 14,280 |
| 18 | Derby (city), CT | 12,325 |
| 19 | Kensington (CDP), CT | 9,962 |
| 20 | Oakville (CDP), CT | 9,504 |