| 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 |
|---|---|---|---|
| 301-334 | Oakland | Garrett | Landline |
| 301-399 | Waldorf | Charles | Wireless |
| 301-996 | Laurel | Prince Georges | Wireless |
| 301-690 | Leonardtown | Saint Marys | Landline |
| 301-523 | Laurel | Prince Georges | Wireless |
| 301-781 | Frostburg | Allegany | Landline |
| 301-658 | Ashton | Montgomery | Landline |
| 301-208 | Gaithersburg | Montgomery | Landline |
| 301-661 | Chevy Chase | Montgomery | Wireless |
| 301-840 | Gaithersburg | Montgomery | Landline |
| 301-907 | Bethesda | Montgomery | Landline |
| 301-739 | Hagerstown | Washington | Landline |
| 301-680 | Silver Spring | Montgomery | Landline |
| 301-849 | Oakland | Garrett | Landline |
| 301-520 | Silver Spring | Montgomery | Wireless |
| 301-898 | Walkersville | Frederick | Landline |
| 301-346 | Silver Spring | Montgomery | Wireless |
| 301-221 | Chevy Chase | Montgomery | Wireless |
| 301-432 | Keedysville | Washington | Landline |
| 301-384 | Silver Spring | Montgomery | Landline |