Frederick, Maryland

ZIP codes in Frederick

Area codes for Frederick

• 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

Frederick is in the Eastern Time zone.

Towns near Frederick

• Ballenger Creek4.7 km (2.9 mi)
• Bartonsville6 km (3.7 mi)
• Spring Ridge6.1 km (3.8 mi)
• Walkersville8.1 km (5.0 mi)
• Braddock Heights8.4 km (5.2 mi)
• Linganore9.2 km (5.7 mi)
• Buckeystown10.3 km (6.4 mi)
• New Market11.4 km (7.1 mi)