Area code 301
Area code 301 serves Silver Spring and nearby parts of Maryland, including Frederick, Rockville and Gaithersburg. It is on Eastern Time, which observes daylight saving time. 240 and 227 are overlays for the same area.
Area code 301 at a glance
Cities in 301
- Silver Spring
- Frederick
- Rockville
- Gaithersburg
An area code shows where a number was first assigned. Mobile numbers keep their area code when people move, so the person you’re calling may be somewhere else.
When you can call a 301 number
Federal telemarketing rules under the TCPA allow sales calls between 8 AM and 9 PM in the called person’s local time. Here is that window for a 301 number, shown in your own time zone.
General information, not legal advice. Some states add rules for Sundays, holidays or the number of calls. See our calling hours guide.
| If you’re on | You can call 301 between |
|---|---|
| Eastern | 8:00 AM to 9:00 PM |
| Central | 7:00 AM to 8:00 PM |
| Mountain | 6:00 AM to 7:00 PM |
| Arizona | 5:00 AM to 6:00 PM |
| Pacific | 5:00 AM to 6:00 PM |
See the time in 301 without leaving your CRM
Parse is a free Chrome extension that shows the local time and weather beside every phone number on the page.
Other area codes in Maryland
Questions about 301
What time zone is area code 301?
Area code 301 is on Eastern Time. It observes daylight saving time.
Where is area code 301?
Area code 301 is in Maryland. Its main city is Silver Spring, and it also covers Frederick, Rockville and Gaithersburg.
What are the legal hours to call a 301 number?
Under the federal TCPA, sales calls are allowed from 8 AM to 9 PM in the called person’s local time. Personal and informational calls are not limited by these hours.
What area codes overlay 301?
240 and 227 cover the same area as 301, so numbers in the same town can have either code.