Gwynn Oak, Maryland

ZIP codes in Gwynn Oak

Area codes for Gwynn Oak

• Area code 410

  In service since October 6, 1991. Shares its area with 443 and 667. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

• Area code 443

  In service since June 1, 1997. Shares its area with 410 and 667. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

• Area code 667

  In service since March 24, 2012. Shares its area with 410 and 443. 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

Gwynn Oak is in the Eastern Time zone.

Towns near Gwynn Oak

• Lochearn2.1 km (1.3 mi)
• Woodlawn2.9 km (1.8 mi)
• Milford Mill3.7 km (2.3 mi)
• Windsor Mill4.4 km (2.7 mi)
• Pikesville5.1 km (3.2 mi)
• Catonsville5.7 km (3.5 mi)
• Randallstown7.6 km (4.7 mi)
• Garrison8.2 km (5.1 mi)