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Area Code 301: Comprehensive Guide to Technical Specifications and Geographic Coverage

Area code 301 is a crucial component of the North American Numbering Plan (NANP), serving western Maryland, including the Greater Washington, D.C. metro area.

Technical Specifications of Area Code 301

  • NPA Code: 301
  • Type: Overlay
  • Implementation Date: 1947
  • State: Maryland

Geographic Coverage

Area code 301 encompasses the western part of Maryland, including the Greater Washington, D.C. metro area, parts of southern Maryland, and rural western Maryland.

Major Cities within Area Code 301

  • 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)

Numbering Statistics

  • Total Numbers Available: Approximately 7.92 million
  • Utilization Rate: 75%
  • Exhaust Projection: 2023

Network Infrastructure

Major Carriers

  • Verizon: 40%
  • AT&T: 30%
  • T-Mobile: 20%
  • Sprint: 10%

Types of Services

  • Landline
  • Wireless
  • VoIP

Regulatory Framework

Historical Milestones

  • 1947: Area code 301 established as one of the original North American area codes.
  • 1991: Area code 410 split from 301 to serve Baltimore and the Eastern Shore.
  • 1997: Area code 240 introduced as an overlay for 301.
  • 2023: Area code 227 added as a third overlay to provide more central office prefixes.

Conclusion

Area code 301 is integral to the telecommunications framework in western Maryland, supporting a diverse mix of urban and rural areas. Its historical development and regulatory oversight highlight the evolving demands of telecommunications in the region.