MARYLAND · AREA CODE GUIDE
240 area code location: Frederick and Gaithersburg, Maryland
- Local date and time
- Eastern Time
Map data: HSIP (2010) · NANPA · US Census Bureau, checked 26 September 2026. Boundaries are approximate.
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Download the 240 area code map
A printable area code 240 location map, with time zone and state. Use the PNG image in a document or slide; the SVG stays sharp at any size.
240 area code at a glance
- State
- Maryland
- Primary cities
- Frederick, Gaithersburg, and Hagerstown
- Established
- Population
- Largest community: Frederick, 92,059 (2025)Not an area-code population.
- Prefixes in service
- 785 as of 13 October 2026
An area code does not show where a caller is now.
History
Country and calling code: United States (+1).
Parent code: 301.
New code planned: No, as of 22 September 2026.
Time zone
- Eastern Time
- Standard time UTC−05:00
- Daylight saving time UTC−04:00
Counties and cities covered
240 numbers are issued across 51 communities. These are telephone exchange areas, which follow the phone network rather than city limits, so a place can sit just outside the boundary of the town it is named for.
Counties of the communities we could place (the code may reach further): Frederick County, Washington County, Allegany County, Garrett County, Charles County, Montgomery County, Carroll County, and St. Mary's County.
- Frederick
- Gaithersburg
- Hagerstown
- Cumberland
- La Plata
- Mount Airy
- Brunswick
- Frostburg
- Walkersville
- Thurmont
- Poolesville
- Middletown
- Leonardtown
- Indian Head
- Smithsburg
- Emmitsburg
- Williamsport
- Myersville
- Oakland
- Westernport
- New Market
- Hancock
- Keedysville
- Lonaconing
- Grantsville
26 more communities
- Friendsville
- Clear Spring
- Kitzmiller
- Ashton 236
- Ashton 238
- Bittinger
- Brandywine
- Buckeystown
- Damascus 236
- Damascus 240
- Flintstone
- Highfield
- Hughesville
- Laurel 236
- Laurel 238
- Lexington Park Great Mills
- McCoole
- Mechanicsville
- Mount Savage
- Nanjemoy
- Ridge
- Tompkinsville
- Waldorf
- Washington
- Washington 236
- Washington 238
Notable places in 240
| Place | Where | What it is |
|---|---|---|
| University of Maryland | 28.2 km from Gaithersburg | University, 44,110 12-month enrollment (2023–24) |
| Camp David | 5.7 km from Thurmont | Military base |
| Northwest Stadium | 25.1 km from Brandywine | Stadium |
| Joint Base Andrews | 14.3 km from Brandywine | US Air Force installation |
| Fort Detrick | 1.4 km from Frederick | US Army installation |
| Bowie State University | 39.3 km from Brandywine | University, 7,274 12-month enrollment (2023–24) |
| Six Flags America | 26.7 km from Brandywine | Amusement park |
| College Park Airport | 30.1 km from Gaithersburg | Airport |
| Capital Centre | 24.6 km from Brandywine | Arena |
| Uniformed Services University of the Health Sciences | 18.9 km from Gaithersburg | University |
Area code 227 has its own page.
Area code 240
240 started service on .It came from 301.
Its numbers are issued in the same communities as 301.
No new code is planned for the region as of .
Area code 301 has its own page.
Questions about 240
Where is the 240 area code?
240 is in Maryland. Its numbers are issued in Frederick, Gaithersburg, Hagerstown, and 48 other communities.
What time zone is area code 240 in?
240 is in Eastern Time. Daylight saving time is observed.
Is 240 an overlay?
Yes. 240 was added as an overlay on 301 on 1 June 1997.
What cities are in the 240 area code?
Frederick, Gaithersburg, Hagerstown, Cumberland, and La Plata, and 46 other communities.
What state is area code 240 in?
Area code 240 is in Maryland.
What counties are covered by area code 240?
Area code 240 covers communities in Frederick County, Washington County, Allegany County, Garrett County, Charles County, Montgomery County, Carroll County, and St. Mary's County.
Is 240 a toll-free area code?
No. 240 is a geographic area code. The toll-free codes are 800, 833, 844, 855, 866, 877, and 888.
Sources: NANPA area code listing, NANPA places by area code, NANPA central office code assignments, U.S. Census Bureau population estimates, OMB metropolitan area delineations. Checked .
Business phone numbers in area code 240, answered by an AI agent
A local number for Frederick, Gaithersburg, and Hagerstown, Maryland, with an AI receptionist that takes caller details, answers the questions you give it, and books appointments. Numbers depend on what carriers have left.