New Jersey's 12th congressional district (NJ-12)
New Jersey's 12th congressional district (NJ-12) covers parts or all of Somerset County, Mercer County, Middlesex County and Union County, and 51 ZIP codes (30 wholly inside it). Its 2020 population was 774,696. This is the map in force for the November 3, 2026 election.
Who represents NJ-12
| Office | Member | Contact |
|---|---|---|
| U.S. Representative (NJ-12) | Bonnie Watson Coleman (D) | 202-225-5801 |
| U.S. Senator | Andy Kim (D) | 202-224-4744 |
| U.S. Senator | Cory A. Booker (D) | 202-224-3224 · 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 NJ-12 |
|---|---|
| Somerset County | 54% |
| Mercer County | 54% |
| Middlesex County | 37% |
| Union County | 9.5% |
ZIP codes
Percentages mark ZIPs only partly in NJ-12: the share of that ZIP's residents inside it.
- 07060 (100%)
- 07062
- 07063 (100%)
- 07726 (<0.1%)
- 07747 (12%)
- 08502
- 08512 (45%)
- 08525 (87%)
- 08528
- 08530 (11%)
- 08534
- 08536
- 08540 (97%)
- 08542
- 08544
- 08550
- 08553
- 08558
- 08560 (99%)
- 08608
- 08609 (74%)
- 08610 (15%)
- 08611 (98%)
- 08618
- 08628
- 08629 (62%)
- 08638
- 08648 (0.3%)
- 08805 (86%)
- 08807 (11%)
- 08810
- 08812 (53%)
- 08816
- 08821 (76%)
- 08823
- 08824
- 08828
- 08831
- 08835
- 08844 (92%)
- 08846
- 08850
- 08852
- 08857 (95%)
- 08873
- 08880
- 08882
- 08884
- 08890
- 08901 (1.8%)
- 08902
Towns
Bound Brook borough, Cranbury township, Dunellen borough, East Brunswick township, Ewing township, Franklin township, Helmetta borough, Hopewell borough, Hopewell township, Jamesburg borough, Manville borough, Middlesex borough, Millstone borough, Milltown borough, Monroe township, Montgomery township, North Brunswick township, North Plainfield borough, Pennington borough, Plainfield city, Plainsboro township, Princeton, Rocky Hill borough, South Bound Brook borough, South Brunswick township, South River borough, Spotswood borough, Trenton city, West Windsor township, Hillsborough township, Old Bridge township and Bridgewater township.
Get this in your AI agent
Your agent can draw every precinct in NJ-12, 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:3412", children_level="precinct", include_districts=True)