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By the fall of 1990, it was apparent that Maryland needed another area code. In November 1990, a plan for a second area code, 410, was announced, that would be assigned to the Baltimore metropolitan area and the Eastern Shore, while western and southern Maryland, including the Washington suburbs, would retain area code 301. [2]
Area code 301 was the first area code for all of Maryland, from 1947, when the area code system was created, until 1991, when everything from Baltimore eastward split off as area code 410. In 1997, area code 240 was added as an overlay area code for the 301 territory.
The state of Maryland is served by the following area codes: Area codes Numbering plan area 227 240 301: ... eastern Maryland including Baltimore and Annapolis
1878: First phone directory printed in Connecticut. Telegraph manager George Coy of New Haven, Connecticut, developed an exchange—the system that allows people to call each other—within a year ...
C&P Tel. Co. of Maryland logo, 1964-1969. The C&P Telephone Company of Maryland was founded in 1884 as The Chesapeake and Potomac Telephone Company of Baltimore City. [1] It changed its name to The Chesapeake and Potomac Telephone Company of Maryland on January 3, 1956, and the corporate name at this point changed to C&P Telephone of Maryland.
Baltimore [a] is the most populous city in the U.S. state of Maryland.With a population of 585,708 at the 2020 census, it is the 30th-most populous US city. [15] Baltimore was designated as an independent city by the Constitution of Maryland [b] in 1851.