| 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 |
|---|---|---|---|
| 301-360 | Frederick | Frederick | Landline |
| 301-276 | Brentwood | Prince Georges | Landline |
| 301-794 | Hyattsville | Prince Georges | Landline |
| 301-810 | Monrovia | Frederick | Landline |
| 301-277 | Riverdale | Prince Georges | Landline |
| 301-753 | Temple Hills | Prince Georges | Landline |
| 301-731 | Hyattsville | Prince Georges | Landline |
| 301-557 | Brentwood | Prince Georges | Landline |
| 301-458 | Brentwood | Prince Georges | Landline |
| 301-417 | Gaithersburg | Montgomery | Landline |
| 301-982 | College Park | Prince Georges | Landline |
| 301-875 | Laurel | Howard | Landline |
| 301-995 | Patuxent River | Saint Marys | Landline |
| 301-567 | Temple Hills | Prince Georges | Landline |
| 301-893 | Waldorf | Charles | Landline |
| 301-713 | Takoma Park | Montgomery | Landline |
| 301-782 | Brandywine | Prince Georges | Landline |
| 301-389 | Laurel | Prince Georges | Landline |
| 301-574 | Upper Marlboro | Prince Georges | Landline |
| 301-575 | Laurel | Howard | Landline |