| 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 |
|---|---|---|---|
| 301-572 | Silver Spring | Montgomery | Landline |
| 301-246 | Nanjemoy | Charles | Landline |
| 301-295 | Bethesda | Montgomery | Landline |
| 301-468 | Rockville | Montgomery | Landline |
| 301-463 | Lonaconing | Allegany | Landline |
| 301-543 | Laurel | Howard | Landline |
| 301-330 | Gaithersburg | Montgomery | Landline |
| 301-412 | Chevy Chase | Montgomery | Wireless |
| 301-675 | Silver Spring | Montgomery | Wireless |
| 301-837 | Mount Rainier | Prince Georges | Landline |
| 301-371 | Middletown | Frederick | Landline |
| 301-719 | Brentwood | Prince Georges | Landline |
| 301-312 | Chevy Chase | Montgomery | Wireless |
| 301-483 | Laurel | Anne Arundel | Landline |
| 301-841 | Mount Rainier | Prince Georges | Landline |
| 301-916 | Poolesville | Montgomery | Landline |
| 301-406 | Bethesda | Montgomery | Wireless |
| 301-525 | Gaithersburg | Montgomery | Landline |
| 301-879 | Silver Spring | Montgomery | Landline |
| 301-812 | North Beach | Calvert | Landline |