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The state of Maryland is served by the following area codes: ... Numbering plan area 227 240 301: western Maryland, including its suburbs of Washington, D.C. 410 443 667:
The three area codes are overlay codes for one numbering plan area, among which 410 was the initial area code for the NPA, when it was split from area code 301 in 1991. 443 and 667 found assignment primarily in cellular service and for competitive local exchange carriers, such as Comcast and Cavalier Telephone, when introduced, but have since ...
This is a list of telephone area codes of Pennsylvania. In 1947, the American Telephone and Telegraph Company divided Pennsylvania into four numbering plan areas (NPAs) and assigned distinct area codes for each. Since 1995, several relief actions in form of area code splits and overlays have expanded the list of area
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. On June 14, 2023, a third overlay code, 227, was added to provide more ...
Area code 835 was eventually approved by the Public Utility Commission on December 2, 2021. Assignment of central office codes in the new area code began on September 2, 2022. [4] When area codes were introduced in 1947, their middle digit was either 0 or 1. In 1994, area code 610 was the last area code assigned with digit 1 in that position.
Map of the United States with Pennsylvania highlighted. There are 56 municipalities classified as cities in the U.S. state of Pennsylvania. [1] Each city is further classified based on population, with Philadelphia being of the first class, Pittsburgh of the second class, Scranton of the second class A, and the remaining 53 cities being of the third class.
Map of previous proposed split of 814 with 582, showing county lines. When numbering pool exhaustion became a threat in the 2000s, the Pennsylvania Public Utility Commission (PUC) approved a numbering plan split in December 2009, that would have assigned area code 582 to most of the northwestern portion of the territory, including Erie, by 2012. [2]
For relief, area code 267 was established as an overlay on the 215 numbering plan area on July 1, 1997. Local calls across the Delaware/Pennsylvania border required ten-digit dialing. Area code 445 was first proposed in July 2000 as an overlay code on numbering plan area 215/267. [1]