| District ID | 4th District |
| Representative | Jim Himes |
| Party Affiliation | Democrat |
| Partisan Voting Index (PVI) | D+7 |
| 06907 |
| 06906 |
| 06905 |
| 06903 |
| 06902 |
| 06901 |
| 06897 |
| 06896 |
| 06890 |
| 06883 |
| 06880 |
| 06878 |
| 06877 |
| 06870 |
| 06855 |
| 06854 |
| 06853 |
| 06851 |
| 06850 |
| 06840 |
| 06831 |
| 06830 |
| 06825 |
| 06824 |
| 06820 |
| 06810 |
| 06807 |
| 06615 |
| 06612 |
| 06611 |
| 06610 |
| 06608 |
| 06607 |
| 06606 |
| 06605 |
| 06604 |
| 06488 |
| 06484 |
| 06478 |
| 06470 |
| 06468 |