Boundary Atlas

ZIP code 08520: Twin Rivers, NJ

ZIP code 08520 is in Twin Rivers (27% of residents) and Hightstown (20%), in Mercer County, New Jersey. 53% of its residents live outside city limits. It is in New Jersey's 3rd congressional district. Its state senate district is State Senate District 14; its state house district is Assembly District 14.

29,291residents (2020 Census)
18.0 sq miland area
2cities and towns
1congressional district
21voting precincts

See it on the mapAll of New Jersey

City and county

City or townShare of ZIP residents
Twin Rivers27%
Hightstown20%

CountyShare of ZIP residents
Mercer County100%

Town or county subdivisionShare of ZIP residents
East Windsor township78%
Hightstown borough20%
Robbinsville township1.7%

Congressional district

Congressional districtShare of ZIP residents
New Jersey's 3rd congressional district (NJ-03)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 14100%

State house districtShare of ZIP residents
Assembly District 14100%

Voting precincts

21 voting precincts overlap ZIP 08520. 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:08520")

ZIP 08520 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.