Boundary Atlas

ZIP code 08638: Trenton, NJ

ZIP code 08638 is in Trenton (43% of residents) and The College of New Jersey (1.2%), in Mercer County, New Jersey. 56% 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.

23,548residents (2020 Census)
5.4 sq miland area
2cities and towns
1congressional district
20voting precincts

See it on the mapAll of New Jersey

City and county

City or townShare of ZIP residents
Trenton43%
The College of New Jersey1.2%

CountyShare of ZIP residents
Mercer County100%

Town or county subdivisionShare of ZIP residents
Ewing township57%
Trenton city43%

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

20 voting precincts overlap ZIP 08638. 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:

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ZIP 08638 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.