White Oak, Maryland

Nearest ZIP codes to White Oak

These are the ZIP codes nearest to White Oak, each listed with the post office it is named after.

Area codes for White Oak

• 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

White Oak is in the Eastern Time zone.

Towns near White Oak

• Burnt Mills1.5 km (0.9 mi)
• Hillandale2.2 km (1.4 mi)
• Kemp Mill3 km (1.9 mi)
• Four Corners3.1 km (1.9 mi)
• Colesville3.4 km (2.1 mi)
• Calverton3.5 km (2.2 mi)
• Silver Spring4.1 km (2.5 mi)
• Fairland5.1 km (3.2 mi)