301 Area Code
Covers Silver Spring and nearby communities in Maryland.
(301) 555-0142Area code 301 map
Interactive coverage map for area code 301, centered on Silver Spring, Maryland
38.9907, -77.0261
Open in OpenStreetMapArea code 301 coverage map — centered on Silver Spring. Shaded area shows the approximate reach around the primary city.
If you are trying to place Silver Spring, MD on the map, area code 301 is the one that covers it. It reaches roughly 294,000 people across places such as Silver Spring, Frederick, Gaithersburg, Rockville and more. The region observes Eastern time, so a number like (301) 555-0142 is on that clock right now. On the ground it spans Montgomery, Frederick, Prince Georges and nearby counties. It shares its territory with the overlay code 227, which sit on the exact same map. Because the 301 region uses more than one area code, you must dial all ten digits — area code included — even for a local call. You do not, however, need to dial a leading 1 for calls within the US and Canada. Keep reading for the current local time in Silver Spring, a map of the 301 coverage area, the places it reaches, nearby and overlay codes, and how to tell a real 301 call from a scam.
Cities covered by 301
Cities & neighborhoods
- Silver Spring
- Frederick
- Gaithersburg
- Rockville
- Bowie
- Hagerstown
- Aspen Hill
- Chillum
- Clinton
- College Park
- Cumberland
- Fairland
- Fort Washington
- Germantown
- Greenbelt
- Landover
- Montgomery Village
- North Bethesda
- North Potomac
- Olney
- Potomac
- Saint Charles
- South Laurel
- Suitland
- Waldorf
- White Oak
Counties
- Montgomery
- Frederick
- Prince Georges
- Washington
- Allegany
- Charles
Looking for the broader picture? See all Maryland area codes.
Nearby & overlay area codes
Overlay codes (same area)
These share 301’s geography — a number in either code can be on the same street.
Neighboring codes
Codes for adjacent regions and metros.
Is a call from 301 a scam?
Area code 301 serves Silver Spring and the surrounding area, so most calls are ordinary local and business traffic. As everywhere, spam and robocalls do use 301 numbers, frequently by spoofing a local-looking caller ID to boost pickup rates. The area code itself tells you nothing about who is really calling, so judge the call by what's said, not the number.
Red flags to watch for
- Pressure to act right now, or threats of arrest, fines, or service being cut off.
- Requests to pay with gift cards, wire transfer, crypto, or a payment app.
- Asking for passwords, one-time codes, your SSN, or full card/bank numbers.
- A robocall or recording, or a number that won’t let you call back.
When unsure, hang up and call the organization back on a number you look up yourself.
Calling a 301 number from abroad
Every 301 number is a US/Canada +1 number. From a mobile anywhere, the simplest approach is to dial it in international format:
+1 301 555-0142If your phone can’t dial the +, replace it with your country’s exit code, then 1, then the number:
- UK, Germany, France & most of Europe
00 1 301 555-0142 - Australia
0011 1 301 555-0142 - Japan
010 1 301 555-0142 - Mexico
00 1 301 555-0142
Within the US and Canada you don’t need any of this — just dial the ten digits 301 555-0142.
Reverse phone lookup
Check any US or Canada number to see whether it's a working line, which carrier it sits on, whether it's mobile, landline or VoIP, and roughly where it's registered.
Shows carrier, line type and location. Owner name isn't available here.
Results are for personal, informational use only and may not be used for employment, credit, housing or tenant-screening decisions.
Area code 301: frequently asked questions
Where is the 301 area code located?
The 301 area code is located in Maryland, centered on Silver Spring. It covers Montgomery, Frederick, Prince Georges, Washington, Allegany, Charles and nearby communities including Silver Spring, Frederick, Gaithersburg, Rockville, Bowie, Hagerstown.
What time zone is 301 in?
Area code 301 is in the Eastern time zone (UTC-5 (EST) / UTC-4 (EDT)). You can see the exact current local time for Silver Spring on the live clock above.
What cities use area code 301?
Cities and areas that use 301 include Silver Spring, Frederick, Gaithersburg, Rockville, Bowie, Hagerstown. Its primary city is Silver Spring, MD.
Do I need to dial 1 before 301?
For calls within the US, you do not need to dial a leading 1, but you do need all ten digits: 301 plus the seven-digit number. The 301 area requires ten-digit dialing because more than one area code serves it.
Is 301 a toll-free or scam number?
No — 301 is a normal geographic area code for Silver Spring, not a toll-free code (toll-free codes are 800, 833, 844, 855, 866, 877 and 888). A 301 number is not inherently a scam, but the code can be spoofed. See the spam-call section above for how to tell.
What are the overlay area codes for 301?
Area code 301 is overlaid by 227, meaning those codes cover the same geographic area.