Mount Rainier, Maryland

ZIP codes in Mount Rainier

Area codes for Mount Rainier

• 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

Mount Rainier is in the Eastern Time zone.

Towns near Mount Rainier

• Brentwood1.1 km (0.7 mi)
• North Brentwood1.3 km (0.8 mi)
• Cottage1.5 km (0.9 mi)
• Colmar Manor2.6 km (1.6 mi)
• Chillum2.9 km (1.8 mi)
• Edmonston3 km (1.9 mi)
• Hyattsville3.2 km (2.0 mi)
• Bladensburg3.4 km (2.1 mi)