Potomac, Maryland

ZIP codes in Potomac

Area codes for Potomac

• 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

Potomac is in the Eastern Time zone.

Towns near Potomac

• North Potomac3.4 km (2.1 mi)
• Rockville4.6 km (2.9 mi)
• Travilah5.7 km (3.5 mi)
• Washington Grove5.8 km (3.6 mi)
• Suburb Maryland Fac5.9 km (3.7 mi)
• Derwood6.6 km (4.1 mi)
• Redland6.6 km (4.1 mi)
• Gaithersburg6.7 km (4.2 mi)