| 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 |
|---|---|---|---|
| 301-790 | Hagerstown | Washington | Landline |
| 301-562 | Takoma Park | Montgomery | Landline |
| 301-231 | Rockville | Montgomery | Landline |
| 301-419 | Laurel | Prince Georges | Landline |
| 301-704 | Silver Spring | Montgomery | Wireless |
| 301-366 | Gaithersburg | Montgomery | Wireless |
| 301-220 | College Park | Prince Georges | Landline |
| 301-668 | Frederick | Frederick | Landline |
| 301-955 | Mount Rainier | Prince Georges | Landline |
| 301-813 | Chevy Chase | Montgomery | Landline |
| 301-789 | Brentwood | Prince Georges | Landline |
| 301-392 | Port Tobacco | Charles | Landline |
| 301-606 | Frederick | Frederick | Wireless |
| 301-232 | Ashton | Montgomery | Landline |
| 301-273 | Silver Spring | Montgomery | Landline |
| 301-367 | Silver Spring | Montgomery | Wireless |
| 301-284 | Rockville | Montgomery | Landline |
| 301-351 | Silver Spring | Montgomery | Wireless |
| 301-568 | District Heights | Prince Georges | Landline |
| 301-608 | Takoma Park | Montgomery | Landline |