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Interactive map of the numbering plan areas of the Commonwealth of Pennsylvania (blue). 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.
Pittsburgh is the largest city by population to be sometimes considered within the Appalachian region. As defined by the 2020 census, the following metropolitan statistical areas and micropolitan statistical areas (MSAs) are sometimes included as part of Appalachia: [citation needed]
The Coal Region is a term used to refer to an area of Northeastern Pennsylvania in the central Appalachian Mountains. The region is home to the largest known deposits of anthracite coal in the world with an estimated a reserve of seven billion tons.
The following list contains the 420 counties and eight independent cities that comprise the region of Appalachia as defined by the Appalachian Regional Commission. The ARC was established by the United States federal government in 1965 to alleviate poverty in the Appalachian region, and currently monitors areas in 13 states.
U.S. Census Bureau regions and divisions. Since 1950, the United States Census Bureau defines four statistical regions, with nine divisions. [1] [2] The Census Bureau region definition is "widely used... for data collection and analysis", [3] and is the most commonly used classification system.
Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.
A study conducted in 1981 comparing the perceptions of Appalachia's boundaries and the ARC's definition, published in the academic journal Southeastern Geographer, asked respondents to draw an encircled area identifying what they considered to be Appalachia on a map. The study found less than 20% of respondents agreed that southern New York was ...
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