Boundary Atlas

ZIP code 02478: Belmont, MA

ZIP code 02478 is in Belmont, in Middlesex County, Massachusetts. It is in Massachusetts's 5th congressional district. Its state senate district is Suffolk and Middlesex District; its state house district is 24th Middlesex District.

27,286residents (2020 Census)
4.6 sq miland area
1cities and towns
1congressional district
8voting precincts

See it on the mapAll of Massachusetts

City and county

City or townShare of ZIP residents
Belmont100%

CountyShare of ZIP residents
Middlesex County100%

Town or county subdivisionShare of ZIP residents
Belmont town100%

Congressional district

Congressional districtShare of ZIP residents
Massachusetts's 5th congressional district (MA-05)100%

State legislative districts

State senate districtShare of ZIP residents
Suffolk and Middlesex District100%

State house districtShare of ZIP residents
24th Middlesex District100%

Voting precincts

8 voting precincts overlap ZIP 02478. 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:02478")

ZIP 02478 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.