About Area Code 301
Area code 301 serves Maryland, covering major cities including Rockville, Frederick. Operating in the Eastern Time (ET), this code was established in 1947.
| State | Time Zone | Cities |
|---|---|---|
| Maryland | Eastern Time (ET) | Rockville, Frederick |
Active Area Code
301
Maryland
Eastern Time (ET)
Est. 1947
PRIMARY
Location
Maryland
Rockville
ACTIVE
Coverage
2 Cities
Since 1947
Beware of Spam Calls
Scammers frequently use 301 numbers. Always verify unknown callers before sharing personal information.
Protect Yourself NowCommon Questions
Where is 301?
Located in Maryland, serving Rockville and surrounding areas.
What time zone?
Operates in Eastern Time (ET).
When established?
Area code 301 was introduced in 1947.
Used for spam?
Can be used by legitimate and fraudulent callers. Always verify unknown numbers.