Caller ID for
Area code 240
Area code 240 Frederick, Maryland
Area code 240 is in Maryland, with numbers assigned in Frederick, Gaithersburg, Hagerstown and 35 more places. It’s 12:11 AM there now.
- State
- Maryland6 area codes in Maryland
- Time zone
- Eastern12:11 AM there now
- Exchanges
- 78538 places
- Overlay
- 227 and 301Same area, 10-digit dialing
- No sign-up
- We never contact the number
- Spam risk included
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Where area code 240 is
Numbers in 240 are assigned to 38 places in 10 counties: Frederick County, Washington County, Charles County, Montgomery County, Allegany County, St. Mary's County, plus 4 more.
No single place dominates: Frederick, the largest, has 5% of the exchanges.
- Frederick43
- Gaithersburg40
- Hagerstown33
- Waldorf26
- Leonardtown17
- Cumberland16
- Myersville11
- Hughesville9
- La Plata8
- Brandywine8
- Mechanicsville7
- Ridgely6
- Indian Head6
- Oakland6
- Poolesville6
- Buckeystown5
- Mount Airy5
- Highfield-Cascade4
- Frostburg4
- Hancock4
- Middletown4
- Grantsville3
- Thurmont3
- Clear Spring3
Phone companies in 240
785 blocks of numbers in 240 are held by 39 phone companies. The most belong to T-Mobile (138), Verizon Wireless (85) and AT&T Mobility (69).
A large share, about 53%, belongs to competitive and internet phone carriers; wireless networks hold 38% and local phone and cable companies 10%.
A block’s holder is the company it was first assigned to; numbers can move to other carriers since.
History and overlays
240 went into service in 1997, added to the area of 301.
227 (since 2023) and 301 (since 1947) share the same area, so a new number there can get any of these codes and local calls are dialed with all 10 digits.
106 new exchanges were assigned since 2021, the latest in July 2023.
Calling 240
It’s 12:11 AM Eastern time in 240 right now.
From elsewhere in the U.S., dial 1, 240 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 25 mi
- 703 · Herndon, VA · about 25 mi
- 202 · Washington, DC · about 33 mi
- 771 · Washington, DC · about 33 mi
- 443 · Baltimore, MD · about 52 mi
- 410 · Baltimore, MD · about 53 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 240 area code
Map of the 240 area code around Frederick, Gaithersburg and Hagerstown, Maryland.
Cities on the map
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Questions about 240
Where is area code 240?
In Maryland, covering Frederick, Gaithersburg and Hagerstown and other places across 10 counties.
What time zone is 240 in?
Eastern time. It was 12:11 AM there when this page loaded.
Is 240 an overlay?
Yes. 227 and 301 serve the same area, so dial all 10 digits for local calls.
Which phone companies have 240 numbers?
39 companies hold blocks; the most belong to T-Mobile, Verizon Wireless and AT&T Mobility. About 38% of blocks are wireless.
Is 240 running out of numbers?
Not on record. 106 new exchanges have been assigned since 2021.