| District ID | 1st District |
| Representative | John B. Larson |
| Party Affiliation | Democrat |
| Partisan Voting Index (PVI) | D+12 |
| 06790 |
| 06759 |
| 06489 |
| 06480 |
| 06479 |
| 06467 |
| 06457 |
| 06444 |
| 06416 |
| 06120 |
| 06119 |
| 06118 |
| 06117 |
| 06114 |
| 06112 |
| 06111 |
| 06110 |
| 06109 |
| 06108 |
| 06107 |
| 06106 |
| 06105 |
| 06103 |
| 06098 |
| 06096 |
| 06095 |
| 06091 |
| 06090 |
| 06088 |
| 06074 |
| 06073 |
| 06067 |
| 06065 |
| 06063 |
| 06062 |
| 06061 |
| 06060 |
| 06059 |
| 06058 |
| 06057 |
| 06051 |
| 06042 |
| 06040 |
| 06037 |
| 06035 |
| 06033 |
| 06032 |
| 06027 |
| 06026 |
| 06023 |
| 06021 |
| 06016 |
| 06010 |
| 06002 |