Wireless telephone services have become the most prevalent form of telephone services in Maryland. What are the Best Cell Phone Plans in Montgomery County? The addition of area code 240 has provided enough numbers to last the NPA until 2025. It was introduced on June 1st, 1997, as new phone and pager subscriptions exhausted the 301 area code. Area code 240Īrea code 240 is the overlay code for the 301 area code. Various parts of the state were split off to create other area codes and so shrinking its service area to the west and parts of southern Maryland. Its Numbering Plan Area covered the entire State of Maryland for 44 years. Area code 301Īrea Code 301 was one of the original area codes introduced in 1947 by the NANP. Cities in Montgomery County covered by these area codes include Ashton, Chevy Chase, Rockville, Montgomery Village, Kensington, Bethesda, Gaithersburg, Poolesville, and Takoma Park. These area codes serve the state’s western and southern parts, including Maryland’s part of the greater Washington D.C. The two area codes currently in service in Montgomery County are area codes 301 and 240. The Maryland Public Service Commission has the authority to administer area codes in Maryland. There are currently two area codes serving the County of Montgomery. They define specific Numbering Plan Areas (NPAs) created by the North American Numbering Plan (NANP) and indicate where phone calls originate. Area codes are the sets of three numbers at the start of all local phone numbers in America.

Phone number 301 area code