Zip Area Code

Glenwood, Maryland

Glenwood, Maryland, in Howard County, has ZIP code 21738 and area code 410, with overlays 443 and 667.

ZIP code
21738
Area codes
410, 443, 667
Time zone
Eastern Time
Coordinates
39.2795, -77.0148

ZIP codes in Glenwood

ZIP codePost officeCountyArea codes
21738GlenwoodHoward County410, 443, 667

Area codes for Glenwood

  • 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

Glenwood is in the Eastern Time zone.

Towns near Glenwood

Local numbers in area code 410

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