| 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 |
|---|---|---|---|
| 301-544 | Rockville | Montgomery | Wireless |
| 301-561 | Silver Spring | Montgomery | Landline |
| 301-856 | Andrews Air Force Base | Prince Georges | Landline |
| 301-783 | Cumberland | Allegany | Landline |
| 301-518 | Silver Spring | Montgomery | Wireless |
| 301-433 | Oxon Hill | Prince Georges | Landline |
| 301-324 | Hyattsville | Prince Georges | Landline |
| 301-549 | Laurel | Anne Arundel | Landline |
| 301-715 | Upper Marlboro | Prince Georges | Landline |
| 301-340 | Rockville | Montgomery | Landline |
| 301-866 | Patuxent River | Saint Marys | Landline |
| 301-305 | Frederick | Frederick | Wireless |
| 301-216 | Gaithersburg | Montgomery | Landline |
| 301-415 | Takoma Park | Montgomery | Landline |
| 301-294 | Rockville | Montgomery | Landline |
| 301-513 | College Park | Prince Georges | Landline |
| 301-768 | Glen Echo | Montgomery | Landline |
| 301-918 | Hyattsville | Prince Georges | Landline |
| 301-394 | Silver Spring | Montgomery | Landline |
| 301-337 | Gaithersburg | Montgomery | Landline |