| 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 |
|---|---|---|---|
| 301-877 | Andrews Air Force Base | Prince Georges | Landline |
| 301-914 | Swanton | Garrett | Landline |
| 301-496 | Bethesda | Montgomery | Landline |
| 301-455 | Laurel | Prince Georges | Wireless |
| 301-696 | Frederick | Frederick | Landline |
| 301-570 | Ashton | Montgomery | Landline |
| 301-631 | Frederick | Frederick | Landline |
| 301-830 | Silver Spring | Montgomery | Landline |
| 301-854 | Columbia | Howard | Landline |
| 301-603 | Silver Spring | Montgomery | Landline |
| 301-213 | Laurel | Prince Georges | Wireless |
| 301-934 | Port Tobacco | Charles | Landline |
| 301-582 | Hagerstown | Washington | Landline |
| 301-895 | Grantsville | Garrett | Landline |
| 301-214 | Bethesda | Montgomery | Landline |
| 301-379 | Laurel | Prince Georges | Wireless |
| 301-679 | Brentwood | Prince Georges | Landline |
| 301-229 | Bethesda | Montgomery | Landline |
| 301-219 | Chevy Chase | Montgomery | Wireless |
| 301-953 | Laurel | Anne Arundel | Landline |