Area Code 301: Silver Spring, Maryland
301 is a telephone area code serving Maryland, including Silver Spring, Rockville. It is part of the North American Numbering Plan and is dialed with the country code +1.
Numbers beginning with 301 are located in Maryland, United States (NANP region: DC Metro). The code covers Silver Spring, Rockville.
How to Dial Area Code 301
| Calling from | What to dial |
|---|---|
| Anywhere in the US or Canada | 1 301 XXX-XXXX (10-digit dialing: 301 + 7-digit number) |
| Local call inside the same area code | 7-digit number in most areas; 10 digits where an overlay code is active |
| From the UK or Europe | 00 1 301 XXX XXXX |
| From Australia | 0011 1 301 XXX XXXX |
| From a mobile phone anywhere | +1 301 XXX XXXX |
Whatever country you are calling from, the + symbol replaces the exit code. Save the contact as +1 301 XXXXXXX and it will dial correctly from any phone in the world.
Time Zone for Area Code 301
Calls to a 301 number ring in the America/New_York time zone, standard offset UTC-05:00. Daylight saving time applies here, so the offset moves forward one hour from March to November.
Cities and Communities Served by 301
The following places fall inside the 301 calling area:
Other Area Codes in Maryland
These codes also serve Maryland. Area codes are assigned by the North American Numbering Plan Administration (NANPA).
| Area Code | Cities / Coverage |
|---|---|
| 240 | Suburban MD (overlay) |
| 410 | Baltimore, Annapolis |
| 443 | Baltimore (overlay) |
| 667 | Baltimore (overlay) |
See all 5 area codes in Maryland →
Frequently Asked Questions
Where is area code 301?
Area code 301 is in Maryland, United States. It covers Silver Spring, Rockville.
What time zone is area code 301 in?
Area code 301 rings in the America/New_York time zone (UTC-05:00 standard).
Do I need to dial 1 before area code 301?
Yes, for a long-distance call inside the US and Canada you dial 1 first, then 301, then the seven-digit number. The 1 is the North American long-distance trunk prefix — it is not the country code. From outside North America you dial your exit code then 1 then 301.
Is area code 301 toll-free?
No. 301 is a standard geographic area code, so normal long-distance rates apply unless your plan includes them. Toll-free NANP codes are 800, 833, 844, 855, 866, 877 and 888.