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Area Code 240: Comprehensive Guide to Coverage and Technical Details

Area code 240 is an integral part of the North American Numbering Plan (NANP), serving the western region of Maryland, including the Greater Washington, D.C. metro area.

Overview of Area Code 240

Area code 240 is an overlay for the original 301 area code, implemented to address the growing demand for phone numbers in Maryland. It was introduced on June 1, 1997, and covers a significant portion of western Maryland.

Geographic Coverage

Area code 240 encompasses the western part of Maryland, including the Greater Washington, D.C. metro area, parts of southern Maryland, and rural western regions.

Major Cities within Area Code 240

  • Aspen Hill: 39.07955, -77.07303
  • North Bethesda: 39.04455, -77.11887
  • Bowie: 38.94278, -76.73028
  • Chillum: 38.96372, -76.99081
  • Clinton: 38.76511, -76.89831
  • College Park: 38.98067, -76.93692
  • Cumberland: 39.65287, -78.76252
  • Fairland: 39.07622, -76.95775
  • Fort Washington: 38.70734, -77.02303
  • Frederick: 39.41427, -77.41054
  • Gaithersburg: 39.14344, -77.20137
  • Germantown: 39.17316, -77.27165
  • Greenbelt: 39.00455, -76.87553
  • Hagerstown: 39.64176, -77.71999
  • Landover: 38.934, -76.89664
  • Montgomery Village: 39.17677, -77.19526
  • North Potomac: 39.08289, -77.26498
  • Olney: 39.15316, -77.06692
  • Potomac: 39.01817, -77.20859
  • Rockville: 39.084, -77.15276
  • Silver Spring: 38.99067, -77.02609
  • Saint Charles: 38.60317, -76.93858
  • Suitland: 38.84872, -76.92386
  • Waldorf: 38.62456, -76.93914
  • White Oak: 39.03983, -76.99303

Technical Specifications

  • NPA Code: 240
  • Type: Overlay
  • Implementation Date: June 1, 1997
  • State: Maryland

Numbering and Utilization

  • Total Numbers Available: Data not specified
  • Utilization Rate: Data not specified
  • Exhaust Projection: Data not specified

Network Infrastructure

Major Carriers

[List of major carriers with market share percentages]

Services Offered

  • Landline
  • Wireless
  • VoIP

Regulatory Framework

  • Regulatory Body: North American Numbering Plan Administration (NANPA)
  • Dialing Requirements: Ten-digit dialing (area code + number)
  • NANPA Regulations: Compliant with NANPA's overlay plan regulations

Historical Context

  • 1947: Establishment of area code 301 as one of the original North American area codes.
  • 1991: Split of area code 301 to create area code 410 for Baltimore and the Eastern Shore.
  • 1997: Introduction of area code 240 as an overlay for the 301 territory.
  • 2023: Addition of area code 227 as a third overlay to provide more central office prefixes.

Conclusion

Area code 240 is pivotal to the telecommunications framework in western Maryland and the Greater Washington, D.C. area. Its overlay system effectively manages the increasing demand for telephone numbers.

For further details, visit the official NANPA website.