National Harbor, Maryland

Nearest ZIP codes to National Harbor

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

Area codes for National Harbor

• 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

National Harbor is in the Eastern Time zone.

Towns near National Harbor

• Forest Heights2.3 km (1.4 mi)
• Oxon Hill3.1 km (1.9 mi)
• Friendly4.4 km (2.7 mi)
• Glassmanor4.4 km (2.7 mi)
• Temple Hills6.6 km (4.1 mi)
• Hillcrest Heights6.8 km (4.2 mi)
• Fort Washington6.9 km (4.3 mi)
• Marlow Heights7 km (4.3 mi)