Where Is Area Code 301?
Area code 301 is found in the US state of Maryland. Primarily servicing the city of Silver Spring (population: 291576), area code 301 covers 12 counties of Maryland.
Located in the Eastern time zone, area code 301 is on the same time as New York, NY.
Area code 301 was brought into effect on January 1, 1947.
Counties in Area Code 301
- Allegany,
- Anne Arundel,
- Calvert,
- Charles,
- Frederick,
- Garrett,
- Howard,
- Montgomery,
- Prince Georges,
- Saint Marys,
- Washington.
Most Populous Cities in Area Code 301
| City | County | City Population | Time Zone |
|---|---|---|---|
| Silver Spring | Montgomery | 291,576 | EST |
| Hyattsville | Prince Georges | 154,084 | EST |
| Gaithersburg | Montgomery | 139,916 | EST |
| Rockville | Montgomery | 134,991 | EST |
| Frederick | Frederick | 123,516 | EST |
| Bowie | Prince Georges | 97,168 | EST |
| Hagerstown | Washington | 96,315 | EST |
| Upper Marlboro | Prince Georges | 87,394 | EST |
| Germantown | Montgomery | 85,671 | EST |
| Bethesda | Montgomery | 82,803 | EST |
| Waldorf | Charles | 80,228 | EST |
| Laurel | Prince Georges | 58,259 | EST |
| Fort Washington | Prince Georges | 51,762 | EST |
| Potomac | Montgomery | 51,292 | EST |
| Cumberland | Allegany | 43,764 | EST |
| District Heights | Prince Georges | 40,875 | EST |
| Temple Hills | Prince Georges | 39,588 | EST |
| Lanham | Prince Georges | 39,485 | EST |
| Capitol Heights | Prince Georges | 39,413 | EST |
| College Park | Prince Georges | 37,338 | EST |
| Clinton | Prince Georges | 36,147 | EST |
| Montgomery Village | Montgomery | 34,409 | EST |
| Laurel | Howard | 30,217 | EST |
| Mount Airy | Frederick | 30,071 | EST |
| Chevy Chase | Montgomery | 30,067 | EST |
Note: The above list is based off of the top 25 most populous cities in the area code as per 2012 United States Census Bureau estimates.
View all United States Area Codes.
This page was last updated on July 3, 2015.