Boundary Atlas

ZIP code 08550: West Windsor, NJ

ZIP code 08550 is in Princeton Junction (8.4% of residents), in Mercer County, New Jersey. 92% of its residents live outside city limits. It is in New Jersey's 12th congressional district. Its state senate district is State Senate District 15; its state house district is Assembly District 15.

21,034residents (2020 Census)
19.1 sq miland area
1cities and towns
1congressional district
13voting precincts

See it on the mapAll of New Jersey

City and county

City or townShare of ZIP residents
Princeton Junction8.4%

CountyShare of ZIP residents
Mercer County100%

Town or county subdivisionShare of ZIP residents
West Windsor township100%

Congressional district

Congressional districtShare of ZIP residents
New Jersey's 12th congressional district (NJ-12)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 15100%

State house districtShare of ZIP residents
Assembly District 15100%

Voting precincts

13 voting precincts overlap ZIP 08550. Map them, with each precinct's share of the ZIP's residents.

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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:08550")

ZIP 08550 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.