Belmont, Massachusetts

1 ZIP code · Eastern time

ZIP codes (largest first)

02478 · 27,175
Population27,175
StateMassachusetts
CountyMiddlesex County
Time zoneEastern
Land area4.65 sq mi

Area codes in this area

339781

These are the area codes that most often serve Belmont (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Find the ZIP+4 for an address in Belmont

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Population: U.S. Census Bureau, ACS 5-year estimates, 2024.