Where Is Area Code 301?
Area code 301 is a geographic area code for western and southern Maryland. Its primary city is Aspen Hill in Montgomery County. The area code also covers Maryland suburbs of Washington, D.C., and uses Eastern Time.
Area code 301 covers Montgomery and Prince George’s counties, along with communities in Frederick, Washington, Allegany, Garrett, Charles, and St. Mary’s counties. Major population centers include Rockville, Gaithersburg, Frederick, Hagerstown, Cumberland, Bethesda, Silver Spring, Bowie, Waldorf, and Lexington Park.
Notable geographic features in the 301 region include the Potomac River and the Appalachian Mountains in western Maryland. The region also includes portions of the Chesapeake and Ohio Canal National Historical Park, Great Falls, and Antietam National Battlefield near Sharpsburg.
Cities and Communities in the 301 Area Code
- Aspen Hill, Montgomery County
- Bethesda, Montgomery County
- Bowie, Prince George’s County
- Brandywine, Prince George’s County
- College Park, Prince George’s County
- Cumberland, Allegany County
- Damascus, Montgomery County
- Frederick, Frederick County
- Gaithersburg, Montgomery County
- Germantown, Montgomery County
- Greenbelt, Prince George’s County
- Hagerstown, Washington County
- Hyattsville, Prince George’s County
- La Plata, Charles County
- Lanham, Prince George’s County
- Lexington Park, St. Mary’s County
- Oxon Hill, Prince George’s County
- Poolesville, Montgomery County
- Potomac, Montgomery County
- Rockville, Montgomery County
- Silver Spring, Montgomery County
- Takoma Park, Montgomery County
- Upper Marlboro, Prince George’s County
- Waldorf, Charles County
- Wheaton, Montgomery County
History of Area Code 301
Area code 301 was established in 1947 as one of the original North American Numbering Plan area codes. It originally covered the entire state of Maryland.
Maryland split area code 301 in 1991 when area code 410 was assigned to eastern Maryland, including Baltimore and the Eastern Shore. Area code 240 became an overlay for the 301 region in 1997, which added new numbers without requiring existing customers to change area codes. Area code 227 entered service in 2022 as another overlay for the same geographic region.
Key Facts About Area Code 301
- Area code 301 is a geographic area code in Maryland, which is part of the South Atlantic region of the United States.
- Aspen Hill in Montgomery County is the primary city associated with area code 301.
- Area code 301 uses Eastern Time.
- Area code 301 was one of the original North American Numbering Plan codes established in 1947.
- Area code 410 was created from area code 301 during Maryland’s 1991 area code split.
- Area codes 240 and 227 overlay area code 301 in the same Maryland numbering region.
- The National Institutes of Health main campus is in Bethesda, a community covered by area code 301.
- The University of Maryland, College Park and NASA’s Goddard Space Flight Center are in the 301 region.
Frequently Asked Questions
What state is area code 301 in?
Area code 301 is in Maryland.
What major cities use area code 301?
Major cities and communities using area code 301 include Aspen Hill, Rockville, Gaithersburg, Frederick, Hagerstown, Cumberland, Bowie, Bethesda, Silver Spring, and Waldorf.
What time zone is area code 301 in?
Area code 301 uses Eastern Time.
Is area code 301 a toll-free number?
No, area code 301 is a geographic area code, not a toll-free number.