Upper Marlboro, Maryland

ZIP codes in Upper Marlboro

Area codes for Upper Marlboro

• 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

Upper Marlboro is in the Eastern Time zone.

Towns near Upper Marlboro

• Westphalia2.3 km (1.4 mi)
• Brown Station2.3 km (1.4 mi)
• Marlboro2.5 km (1.6 mi)
• Queensland4.3 km (2.7 mi)
• Melwood5.2 km (3.2 mi)
• Brock Hall5.4 km (3.4 mi)
• Largo5.8 km (3.6 mi)
• Kettering6.2 km (3.9 mi)