Massachusetts's 4th congressional district (MA-04)
Massachusetts's 4th congressional district (MA-04) covers parts or all of Bristol County, Norfolk County, Worcester County, Middlesex County and Plymouth County, and 62 ZIP codes (49 wholly inside it). Its 2020 population was 781,103. This is the map in force for the November 3, 2026 election.
Who represents MA-04
| Office | Member | Contact |
|---|---|---|
| U.S. Representative (MA-04) | Jake Auchincloss (D) | 202-225-5931 |
| U.S. Senator | Edward J. Markey (D) | 202-224-2742 · contact form |
| U.S. Senator | Elizabeth Warren (D) | 202-224-4543 · contact form |
Officials serving now (members of Congress until January 3, 2027). Sources: Members of Congress: the @unitedstates project, congress-legislators (CC0).
Counties
| County | Share of the county's residents in MA-04 |
|---|---|
| Bristol County | 64% |
| Norfolk County | 35% |
| Worcester County | 6.4% |
| Middlesex County | 5.7% |
| Plymouth County | 2.2% |
ZIP codes
Percentages mark ZIPs only partly in MA-04: the share of that ZIP's residents inside it.
- 01504
- 01529
- 01747
- 01756
- 01757 (100%)
- 01770
- 02019
- 02030
- 02035
- 02038
- 02048
- 02052
- 02054
- 02056
- 02062 (<0.1%)
- 02067
- 02081 (0.1%)
- 02093
- 02215 (0.1%)
- 02347
- 02445 (99%)
- 02446 (100%)
- 02457
- 02458
- 02459
- 02460
- 02461
- 02462
- 02464
- 02465
- 02466
- 02467 (80%)
- 02468
- 02481 (21%)
- 02482 (20%)
- 02492
- 02494
- 02702
- 02703
- 02715
- 02717
- 02718
- 02720
- 02721
- 02723
- 02724
- 02725
- 02726
- 02747 (0.8%)
- 02760
- 02762
- 02763
- 02764
- 02766
- 02767 (59%)
- 02769
- 02771
- 02777
- 02779
- 02780
- 02790 (2.4%)
- 02861 (0.3%)
Towns
Attleboro city, Bellingham town, Berkley town, Blackstone town, Brookline town, Dighton town, Dover town, Fall River city, Foxborough town, Franklin Town city, Freetown town, Hopedale town, Lakeville town, Mansfield town, Medfield town, Mendon town, Milford town, Millis town, Millville town, Needham town, Newton city, Norfolk town, North Attleborough Town city, Norton town, Plainville town, Rehoboth town, Seekonk town, Sharon town, Sherborn town, Somerset town, Swansea town, Taunton city, Wrentham town, Raynham town and Wellesley town.
Get this in your AI agent
Your agent can draw every precinct in MA-04, or list them with population shares (related_geographies). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
get_boundaries(id="us:congressional_district:2504", children_level="precinct", include_districts=True)