ZIP code 07831: Washington, NJ
ZIP code 07831 is in Warren County, New Jersey, outside any city or Census-designated place. It is in New Jersey's 7th congressional district. Its state senate district is State Senate District 23; its state house district is Assembly District 23.
See it on the mapAll of New Jersey
City and county
Outside any city or Census-designated place.
| County | Share of ZIP residents |
|---|---|
| Warren County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Washington township | 100% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| New Jersey's 7th congressional district (NJ-07) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (NJ-07) | Thomas H. Kean, Jr. (R) | 202-225-5361 | 100% |
| U.S. Senator | Andy Kim (D) | 202-224-4744 | statewide |
| U.S. Senator | Cory A. Booker (D) | 202-224-3224 · contact form | statewide |
| State Senator (State Senate District 23) | Doug Steinhardt (R) | 908-835-0552 | 100% |
| Assembly Member (Assembly District 23) | Erik Peterson (R) | 908-238-0251 | 100% |
| Assembly Member (Assembly District 23) | John DiMaio (R) | 908-684-9550 | 100% |
Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Warren County laws: search for the Warren County, New Jersey code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 23 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| Assembly District 23 | 100% |
Voting precincts
1 voting precinct overlap ZIP 07831. Map them, with each precinct's share of the ZIP's residents.
Get this in your AI agent
Your agent can get these cities, counties, districts and precincts with their shares, and their GeoJSON boundaries, from Boundary Atlas. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:zcta:07831")
ZIP 07831 here is the Census Bureau's ZIP Code Tabulation Area, which approximates the USPS ZIP Code; PO-box-only ZIPs have none. Districts are the maps in force for the November 3, 2026 election.