Riverdale, Maryland

ZIP codes in Riverdale

Area codes for Riverdale

• 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

Riverdale is in the Eastern Time zone.

Towns near Riverdale

• Seat Pleasant0.4 km (0.2 mi)
• Peppermill0.8 km (0.5 mi)
• Cedar Heights1.1 km (0.7 mi)
• Maryland Park1.3 km (0.8 mi)
• Fairmount Heights1.7 km (1.1 mi)
• Walker Mill2.5 km (1.6 mi)
• Summerfield2.6 km (1.6 mi)
• Lanham2.6 km (1.6 mi)