Chester County (Chesco) is a county in the U.S. state of Pennsylvania. As of the 2010 census, the population was 498,886, increasing by 4.1% to a census-estimated 519,293 residents as of 2017. 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 Combined 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.
According to the U.S. Census Bureau, the county has a total area of 759 square miles (1,970 km²), of which 751 square miles (1,950 km²) is land and 8.7 square miles (23 km²) (1.1%) is water. The topography consists of rolling hills and valleys and it is part of the region known as the Piedmont. Watersheds that serve Chester County include the Octoraro, the Brandywine, and Chester creeks, and the Schuylkill River. Many of the soils are fertile, rich loam as much as twenty-four inches thick; together with the temperate climate, this was long a major agricultural area. Because of its proximity to Philadelphia, Chester County has seen large waves of development over the past half-century due to suburbanization. Although development in Chester County has increased, agriculture is still a major part of the county's economy, and the number of horse farms is increasing in the county. Mushroom growing is a specialty in the southern portion of the county.
As of the 2010 census, the county was 82.1% White Non-Hispanic, 6.1% Black or African American, 0.2% Native American or Alaskan Native, 3.9% Asian, 0.0% Native Hawaiian, 1.8% were two or more races, and 2.4% were some other race. 6.5% of the population were Hispanic or Latino.
As of the census of 2000, there were 433,501 people, 157,905 households, and 113,375 families residing in the county. The population density was 573 people per square mile (221/km²). There were 163,773 housing units at an average density of 217 per square mile (84/km²). The racial makeup of the county was 89.21% White, 6.24% Black or African American, 0.15% Native American, 1.95% Asian, 0.03% Pacific Islander, 1.35% from other races, and 1.06% from two or more races. 3.72% of the population were Hispanic or Latino of any race. 18.0% were of Irish, 17.3% German, 13.1% Italian, 10.1% English and 5.6% American ancestry according to their self-reporting on Census 2000. 91.4% spoke English and 3.7% Spanish as their first language.
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