Identifiers: city · CDP · borough
| Rank | Community | Population |
|---|---|---|
| 1 | New Haven (city), CT | 134,023 |
| 2 | West Haven (city), CT | 55,584 |
| 3 | East Haven (CDP), CT | 27,923 |
| 4 | North Haven (CDP), CT | 24,253 |
| 5 | Wallingford Center (CDP), CT | 18,278 |
| 6 | Orange (CDP), CT | 14,280 |
| 7 | Northford (CDP), CT | 6,082 |
| 8 | Branford Center (CDP), CT | 6,026 |
| 9 | Durham (CDP), CT | 3,771 |
| 10 | Clinton (CDP), CT | 3,441 |
| 11 | Deep River Center (CDP), CT | 2,765 |
| 12 | Guilford Center (CDP), CT | 2,586 |
| 13 | Essex Village (CDP), CT | 2,583 |
| 14 | Old Saybrook Center (CDP), CT | 2,278 |
| 15 | Madison Center (CDP), CT | 2,250 |
| 16 | Westbrook Center (CDP), CT | 2,220 |
| 17 | Chester Center (CDP), CT | 1,720 |
| 18 | Saybrook Manor (CDP), CT | 1,172 |
| 19 | Fenwick (borough), CT | 53 |