| District ID | 6th District |
| Representative | Seth W. Moulton |
| Party Affiliation | Democrat |
| Partisan Voting Index (PVI) | D+6 |
| 02420 |
| 02151 |
| 01985 |
| 01984 |
| 01983 |
| 01982 |
| 01970 |
| 01969 |
| 01966 |
| 01965 |
| 01960 |
| 01952 |
| 01951 |
| 01950 |
| 01949 |
| 01945 |
| 01944 |
| 01940 |
| 01938 |
| 01930 |
| 01929 |
| 01923 |
| 01922 |
| 01921 |
| 01915 |
| 01913 |
| 01908 |
| 01907 |
| 01906 |
| 01905 |
| 01904 |
| 01902 |
| 01901 |
| 01887 |
| 01880 |
| 01876 |
| 01867 |
| 01864 |
| 01860 |
| 01845 |
| 01834 |
| 01833 |
| 01821 |
| 01810 |
| 01803 |
| 01801 |
| 01731 |
| 01730 |