| 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 |
|---|---|---|---|
| 301-967 | District Heights | Prince Georges | Landline |
| 301-960 | Silver Spring | Montgomery | Landline |
| 301-758 | Silver Spring | Montgomery | Wireless |
| 301-278 | Brentwood | Prince Georges | Landline |
| 301-585 | Takoma Park | Montgomery | Landline |
| 301-218 | Bowie | Prince Georges | Landline |
| 301-751 | Waldorf | Charles | Wireless |
| 301-685 | Clarksburg | Montgomery | Landline |
| 301-492 | Bethesda | Montgomery | Landline |
| 301-407 | Poolesville | Montgomery | Landline |
| 301-353 | Gaithersburg | Montgomery | Landline |
| 301-601 | Gaithersburg | Montgomery | Landline |
| 301-274 | Hughesville | Charles | Landline |
| 301-775 | Silver Spring | Montgomery | Wireless |
| 301-797 | Hagerstown | Washington | Landline |
| 301-245 | Bittinger | Garrett | Landline |
| 301-622 | Silver Spring | Montgomery | Landline |
| 301-988 | Hagerstown | Washington | Wireless |
| 301-805 | Bowie | Prince Georges | Landline |
| 301-913 | Bethesda | Montgomery | Landline |