Caller ID for
Area code 301
Area code 301 Frederick, Maryland
Area code 301 is one of the original 1947 area codes, in Maryland, with numbers assigned in Frederick, Gaithersburg, Waldorf and 36 more places. It’s 12:11 AM there now.
- State
- Maryland6 area codes in Maryland
- Time zone
- Eastern12:11 AM there now
- Exchanges
- 78439 places
- Overlay
- 227 and 240Same area, 10-digit dialing
- No sign-up
- We never contact the number
- Spam risk included
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Where area code 301 is
Numbers in 301 are assigned to 39 places in 11 counties: Frederick County, Montgomery County, Charles County, Washington County, Allegany County, Garrett County, plus 5 more.
No single place dominates: Frederick, the largest, has 5% of the exchanges.
- Frederick37
- Gaithersburg33
- Waldorf25
- Hagerstown21
- Cumberland14
- Leonardtown9
- Myersville9
- Oakland8
- Indian Head6
- Brandywine4
- Mechanicsville3
- La Plata3
- Keedysville3
- Walkersville2
- Poolesville2
- Kitzmiller2
- Frostburg2
- Mount Airy2
- Friendsville2
- Buckeystown2
- Brunswick2
- Clear Spring2
- New Market2
- Williamsport1
Phone companies in 301
784 blocks of numbers in 301 are held by 27 phone companies. The most belong to Verizon (463), Verizon Wireless (51) and AT&T Mobility (47).
Mostly landline: about 62% of blocks belong to local phone and cable companies, 19% to wireless networks and 19% to other carriers.
A block’s holder is the company it was first assigned to; numbers can move to other carriers since.
History and overlays
301 has been in service since 1947, when the first North American area codes were set up.
227 (since 2023) and 240 (since 1997) share the same area, so a new number there can get any of these codes and local calls are dialed with all 10 digits.
11 new exchanges were assigned since 2021, the latest in July 2025.
Calling 301
It’s 12:11 AM Eastern time in 301 right now.
From elsewhere in the U.S., dial 1, 301 and the 7-digit number; inside the area, all 10 digits too.
Nearby area codes
Maryland has 6 area codes: 227, 240, 301, 410, 443 and 667.
- 571 · Herndon, VA · about 26 mi
- 703 · Herndon, VA · about 26 mi
- 202 · Washington, DC · about 36 mi
- 771 · Washington, DC · about 36 mi
- 443 · Baltimore, MD · about 55 mi
- 410 · Baltimore, MD · about 56 mi
From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.
Map of the 301 area code
Map of the 301 area code around Frederick, Gaithersburg and Waldorf, Maryland.
Cities on the map
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Questions about 301
Where is area code 301?
In Maryland, covering Frederick, Gaithersburg and Waldorf and other places across 11 counties.
What time zone is 301 in?
Eastern time. It was 12:11 AM there when this page loaded.
Is 301 an overlay?
Yes. 227 and 240 serve the same area, so dial all 10 digits for local calls.
Which phone companies have 301 numbers?
27 companies hold blocks; the most belong to Verizon, Verizon Wireless and AT&T Mobility. About 19% of blocks are wireless.
Is 301 running out of numbers?
Not on record. 11 new exchanges have been assigned since 2021.