| General Information about Area Code 301 | |
|---|---|
| Country | United States |
| State / Province / Territory | Maryland |
| Major City | Rockville |
| Time Zone | Eastern (UTC-05:00) |
| Prefix | Primary City | County | Phone Type |
|---|---|---|---|
| 301-707 | Cumberland | Allegany | Wireless |
| 301-548 | Gaithersburg | Montgomery | Landline |
| 301-723 | Cumberland | Allegany | Landline |
| 301-786 | Westernport | Allegany | Landline |
| 301-239 | Riverdale | Prince Georges | Wireless |
| 301-686 | Temple Hills | Prince Georges | Landline |
| 301-615 | College Park | Prince Georges | Wireless |
| 301-420 | District Heights | Prince Georges | Landline |
| 301-776 | Laurel | Anne Arundel | Landline |
| 301-281 | Temple Hills | Prince Georges | Landline |
| 301-576 | Silver Spring | Montgomery | Landline |
| 301-796 | Greenbelt | Prince Georges | Landline |
| 301-347 | Bethesda | Montgomery | Landline |
| 301-604 | Laurel | Anne Arundel | Landline |
| 301-457 | Takoma Park | Montgomery | Landline |
| 301-803 | Bethesda | Montgomery | Landline |
| 301-678 | Hancock | Washington | Landline |
| 301-242 | Brandywine | Prince Georges | Landline |
| 301-400 | Bethesda | Montgomery | Landline |
| 301-344 | College Park | Prince Georges | Landline |