Boundary Atlas

ZIP code 02453: Waltham, MA

ZIP code 02453 is in Waltham, in Middlesex County, Massachusetts. It is in Massachusetts's 5th congressional district. Its state senate district is Third Middlesex District; its state house districts are 9th Middlesex District (54%) and 10th Middlesex District (46%).

31,854residents (2020 Census)
3.6 sq miland area
1cities and towns
1congressional district
9voting precincts

See it on the mapAll of Massachusetts

City and county

City or townShare of ZIP residents
Waltham100%

CountyShare of ZIP residents
Middlesex County100%

Town or county subdivisionShare of ZIP residents
Waltham city100%

Congressional district

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

State legislative districts

State senate districtShare of ZIP residents
Third Middlesex District100%

State house districtShare of ZIP residents
9th Middlesex District54%
10th Middlesex District46%

Voting precincts

9 voting precincts overlap ZIP 02453. 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:02453")

ZIP 02453 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.