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Chester County, Pennsylvania

Chester County, Pennsylvania
Chester County Courthouse.jpg
Seal of Chester County, Pennsylvania
Seal
Map of Pennsylvania highlighting Chester County
Location in the U.S. state of Pennsylvania
Map of the United States highlighting Pennsylvania
Pennsylvania's location in the U.S.
Founded November 1682
Named for Chester, England
Seat West Chester
Largest borough West Chester
Area
 • Total 759 sq mi (1,966 km2)
 • Land 751 sq mi (1,945 km2)
 • Water 8.7 sq mi (23 km2), 1.1%
Population (est.)
 • (2015) 515,939
 • Density 687/sq mi (265/km²)
Congressional districts 6th, 7th, 16th
Time zone Eastern: UTC-5/-4
Website www.chesco.org
Footnotes:
Designated October 26, 1982

Chester County (Chesco) is a county in the U.S. state of Pennsylvania. As of the 2010 census, the population was 498,886. The county seat is West Chester. Chester County was one of the three original Pennsylvania counties created by William Penn in 1682. It was named for Chester, England.

Chester County is part of the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD Metropolitan Statistical Area. Eastern Chester County is home to many communities that comprise part of the Main Line western suburbs of Philadelphia, while part of its southernmost portion is considered suburban Wilmington, along with southwest Delaware County.

Chester County is the highest-income county in Pennsylvania and 24th highest in the nation as measured by median household income (as of 2010).

Philadelphia, Bucks, and Chester were the three Pennsylvania counties initially created by William Penn on August 24, 1682. At that time, Chester County's borders were Philadelphia County to the north, the ill-defined western edge of the colony (approximately the Susquehanna River) to the west, the Delaware River to the east, and Delaware and Maryland to the south. Chester County replaced the Pennsylvania portion of New Netherland/New York’s "Upland", which was officially eliminated when Pennsylvania was chartered on March 4, 1681, but did not cease to exist until June of that year. Much of the Welsh Tract was in eastern Chester County, and Welsh place names, given by early settlers, continue to predominate there.


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