Boundary Atlas

ZIP code 01432: Ayer, MA

ZIP code 01432 is in Ayer (36% of residents), in Middlesex County, Massachusetts. 64% of its residents live outside city limits. It is in Massachusetts's 3rd congressional district. Its state senate district is Middlesex and Worcester District; its state house district is 37th Middlesex District.

8,221residents (2020 Census)
8.5 sq miland area
2cities and towns
1congressional district
3voting precincts

See it on the mapAll of Massachusetts

City and county

City or townShare of ZIP residents
Ayer36%
Devens0.5%

CountyShare of ZIP residents
Middlesex County100%

Town or county subdivisionShare of ZIP residents
Ayer town100%

Congressional district

Congressional districtShare of ZIP residents
Massachusetts's 3rd congressional district (MA-03)100%

State legislative districts

State senate districtShare of ZIP residents
Middlesex and Worcester District100%

State house districtShare of ZIP residents
37th Middlesex District100%

Voting precincts

3 voting precincts overlap ZIP 01432. 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:01432")

ZIP 01432 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.