240 Area Code

The 240 area code is part of the North American Numbering Plan (NANP) and serves western Maryland, USA. It was created in 1997 as an overlay for the 301 area code due to increasing demand for new telephone numbers in the region. The 240 area code covers major cities, suburban communities, and rural areas, providing essential telecommunication services for residents, businesses, and government offices.

Understanding the 240 Area Code

The 240 area code serves western Maryland, including cities and communities such as Rockville, Gaithersburg, Frederick, Hagerstown, and Bethesda. It overlaps the 301 area code, requiring 10digit dialing for all local calls. Both landlines and mobile phones utilize this area code.

240 Area Code Map and Geographic Location

The 240 area code map spans western Maryland, covering Montgomery, Frederick, Washington, and Garrett counties. It includes suburban areas near Washington, D.C., as well as more rural and scenic regions in western Maryland. The area code is part of the Eastern Time Zone.

All Major Cities and Regions in the 240 Area Code

  • Rockville
  • Gaithersburg
  • Frederick
  • Hagerstown
  • Bethesda
  • Potomac
  • Takoma Park
  • Silver Spring
  • Germantown

Counties Covered by the 240 Area Code

  • Montgomery County
  • Frederick County
  • Washington County
  • Garrett County

ZIP Codes within the 240 Telephone Zone (Examples)

  • 20850 Rockville
  • 20877 Gaithersburg
  • 21701 Frederick
  • 21740 Hagerstown
  • 20814 Bethesda
  • 20854 Potomac
  • 20912 Takoma Park
  • 20910 Silver Spring
  • 20874 Germantown

Time Zone

The 240 area code is located in the Eastern Time Zone (ET), observing Eastern Standard Time (EST, UTC5) in winter and Eastern Daylight Time (EDT, UTC4) during daylight saving time.

Dialing, Phone & Service Details

  • Local dialing: 10digit dialing is required for all calls.
  • Longdistance calls within the USA: Dial 1 + 240 + 7digit number.
  • International calls: Dial your country�s exit code + 1 + 240 + 7digit number.
  • Services: 240 area code serves landlines, mobile phones, VoIP, and business telecommunications.

Why the 240 Area Code Matters

The 240 area code provides critical telecommunications coverage for western Maryland, including suburban areas near Washington, D.C., and rural communities. It supports residential, business, educational, and government communication needs and is essential for connectivity in this economically and culturally important region.

What area code is 240? / Where's area code 240?

What area code is 240? � 240 is the overlay area code for western Maryland, serving Rockville, Gaithersburg, Frederick, Hagerstown, and Bethesda.

Where's area code 240? � It is located in western Maryland, USA, overlapping the 301 area code and covering Montgomery, Frederick, Washington, and Garrett counties.

Frequently Asked Questions (FAQ) about 240 Area Code

What is the 240 area code?

The 240 area code serves western Maryland, including Rockville, Gaithersburg, Frederick, Hagerstown, and Bethesda.

When was the 240 area code created?

It was introduced in 1997 as an overlay for the 301 area code.

Where is area code 240 located?

240 covers western Maryland, overlapping the 301 area code, including Montgomery, Frederick, Washington, and Garrett counties.

What time zone is 240 in?

The 240 area code follows the Eastern Time Zone (EST/EDT).

Which counties are included in 240?

Montgomery, Frederick, Washington, and Garrett counties.

240 Area Code