Zip Area Code

Union Bridge, Maryland

Union Bridge, Maryland, in Frederick County, has ZIP code 21791 and area code 301, with overlays 227 and 240.

ZIP code
21791
Area codes
301, 227, 240
Time zone
Eastern Time
Coordinates
39.5799, -77.1319

ZIP codes in Union Bridge

ZIP codePost officeCountyArea codes
21791Union BridgeFrederick County301, 227, 240

Area codes for Union Bridge

  • Area code 301

    In service since 1947. Shares its area with 227 and 240. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

  • Area code 227

    In service since June 14, 2023. Shares its area with 240 and 301. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

  • Area code 240

    In service since June 1, 1997. Shares its area with 227 and 301. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

Area codes here are matched from telephone rate centers, so a place near a boundary can have local numbers from either side of it.

Time zone

Union Bridge is in the Eastern Time zone.

Towns near Union Bridge