| District ID | 4th District |
| Representative | Jake Auchincloss |
| Party Affiliation | Democrat |
| Partisan Voting Index (PVI) | D+9 |
| 02790 |
| 02780 |
| 02779 |
| 02777 |
| 02771 |
| 02770 |
| 02769 |
| 02767 |
| 02766 |
| 02764 |
| 02763 |
| 02762 |
| 02760 |
| 02747 |
| 02726 |
| 02725 |
| 02724 |
| 02723 |
| 02721 |
| 02720 |
| 02718 |
| 02717 |
| 02715 |
| 02703 |
| 02702 |
| 02494 |
| 02492 |
| 02482 |
| 02481 |
| 02468 |
| 02467 |
| 02466 |
| 02465 |
| 02464 |
| 02462 |
| 02461 |
| 02460 |
| 02459 |
| 02458 |
| 02446 |
| 02445 |
| 02347 |
| 02093 |
| 02090 |
| 02067 |
| 02056 |
| 02054 |
| 02053 |
| 02052 |
| 02048 |
| 02038 |
| 02035 |
| 02030 |
| 02026 |
| 02019 |
| 01770 |
| 01760 |
| 01757 |
| 01756 |
| 01747 |
| 01568 |
| 01529 |
| 01504 |