ZIP code · Belmont · Massachusetts · United States
ZIP code 02478 — Belmont
ZIP code 02478 serves Belmont, Massachusetts.
- Postal code
- 02478Single source Value from one source, not cross-checked.
- City
- Belmont
- County
- Middlesex
- State
- Massachusetts
- Country
- United States
- Coordinates
- 42.3959, -71.1787 — precision precise (locality)
View on OpenStreetMap - Population
- 26,966 (ZCTA, ACS 5-year)
- Median household income
- $177,790
- Median age
- 42.4
- Time zone
- America/New_York (UTC−5 / UTC−4 DST)
- Area codes
- 617, 857Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS). Data generated on 2026-08-21. Methodology · Report an error on this page