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Chester County is a county located in the U.S. state of Pennsylvaniamarker. As of 2000, the population was 433,501. The county seat is West Chestermarker. It is the highest-income county measured per capita and by median household income in Pennsylvania, and has the 21st highest gross adjusted income in the nation (as of 2009).

Chester County is one of the three original counties of Pennsylvania created by William Penn in 1682. It is named for Cheshiremarker, Englandmarker. It is part of the Delaware Valley area, and is the only Delaware Valley county in Pennsylvania that does not border Philadelphiamarker, though it is close.


Chester, Philadelphiamarker, and Bucksmarker were the three original Pennsylvania counties created by William Penn on 1682-08-24. At that time, Chester County's borders were Philadelphia County to the north, the western edge of the colony (approximately the Susquehanna River) to the west, the Delaware River to the east, and Delawaremarker and Marylandmarker to the south. Chester County replaced the Pennsylvania portion of New Netherland/New Yorkmarker’s Upland, which was officially eliminated when Pennsylvania was chartered on 1681-03-04, but did not actually cease to exist until June of that year. Much of eastern Chester County was in the Welsh Tract, and Welsh place names continue to predominate there.

The fourth county in the state, Lancaster Countymarker, was formed from Chester County on May 10, 1729. On March 11, 1752 Berks Countymarker was formed from the northern section of Chester County, as well as parts of Lancaster and Philadelphia Counties.

The original Chester County seat was the naval shipbuilding city of Chestermarker. However, it became part of Delaware Countymarker when that county was formed from the eastern portion of the Chester County on September 26, 1789. This took the county seat out of Chester County, so West Chestermarker became the new county seat that year, and has remained so to the present.

Much of the history of Chester County arises from its location between Philadelphia and the Susquehanna River. The first road to "the West" (meaning Lancaster County) passed through the central part of Chester County; with some re-alignments, it became the Lincoln Highway and later U.S. Route 30. For much of its distance, the road is still known as Lancaster Avenue. The first railroadmarker (which became the Pennsylvania Railroad) followed much the same route, and the Reading Railroad progressed up the Schuylkill River to Reading. Industry tended to concentrate along the rail lines. In time, easy transportation allowed workers to commute to urban jobs, and the rise of the suburbs followed. To this day, the built-up areas form "fingers" extending along lines of transportation.

The Battle of Brandywinemarker was fought at what is now the southeastern fringe of the county, and the Valley Forgemarker encampment was at the northeastern edge. The former Valley Forge Army Hospitalmarker, constructed during World War II, was one of the largest military hospitals in the United States.


According to the U.S. Census Bureau, the county has a total area of 760 square miles (1,968 km²), of which, 756 square miles (1,958 km²) of it is land and 4 square miles (10 km²) of it (0.51%) is water. The topography consists of rolling hills and valleys and it is part of the region known as the Piedmont.

Watersheds which service Chester County include the Octoraro Creek, the Brandywine Creek, the Chester Creekmarker, and the Schuylkill River. Many of the soils are fertile, rich loam as much as twenty-four inches thick, resulting with its temperate climate in some of the finest farmland in the world. Due to the close proximity to the Philadelphia area, Chester County has experienced large "waves" of development due to suburbanization. Although development in Chester County has increased, agriculture is still a large form of income for the county. In fact the number of horse farms are increasing in the county.

Adjacent counties

National protected area

State parks


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% Americanmarker ancestry according to Census 2000. 91.4% spoke English and 3.7% Spanish as their first language.

There were 157,905 households out of which 35.10% had children under the age of 18 living with them, 60.50% were married couples living together, 8.10% had a female householder with no husband present, and 28.20% were non-families. 22.60% of all households were made up of individuals and 7.60% had someone living alone who was 65 years of age or older. The average household size was 2.65 and the average family size was 3.15.

In the county, the population was spread out with 26.20% under the age of 18, 7.90% from 18 to 24, 30.40% from 25 to 44, 23.80% from 45 to 64, and 11.70% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 96.40 males. For every 100 females age 18 and over, there were 93.10 males.

The median income for a household in the county was $65,295, and the median income for a family was $76,916 (these figures had risen to $80,818 and $97,894 respectively as of a 2007 estimate). Males had a median income of $51,223 versus $34,854 for females. The per capita income for the county was $31,627. About 3.10% of families and 5.20% of the population were below the poverty line, including 5.10% of those under age 18 and 5.50% of those age 65 or over.

The region was originally occupied by the Lenni Lenape people who greeted European settlers in the seventeenth century with amity and kindness. British settlers were mostly English, Scotch-Irish and Welsh in ethnicity. As time passed, the region has had large influxes of Germans, Africans, Eastern Europeans, Italians, Puerto Ricans, and, more recently, Mexicans.


Presidential elections results
Year GOP Dems
2008 45.0% 112,266 54.2% 135,150
2004 52.0% 120,306 47.5% 109,708
2000 53.4% 100,080 43.7% 82,047
1996 48.7% 77,029 41.0% 64,783
1992 43.7% 74,002 35.2% 59,643
1988 67.0% 93,522 32.1% 44,853
1984 70.1% 92,221 29.6% 38,870
1980 60.9% 73,046 28.6% 34,307
1976 60.4% 67,686 38.1% 42,712
1972 68.4% 72,726 29.3% 31,118
1968 57.2% 56,073 33.3% 32,606
1964 45.5% 40,280 54.1% 47,940
1960 63.6% 53,059 36.2% 30,167

As of November 2008, there are 326,689 registered voters in Chester County.

Chester County has been, and remains, very reliably Republican at the county level. In recent elections, however, it has been trending Democratic. In 2000 Al Gore lost it by almost 10 percent but in 2004 George W. Bush defeated John Kerry by a much smaller margin of only 4.5 percent. Bob Casey Jr. carried it by 10% when he unseated incumbent Republican US Senator Rick Santorum in 2006. In 2008, Chester County sided with the rest of Pennsylvania and voted for Barack Obama by a much larger margin of 9%, making him the first Democrat to carry it in a Presidential election since 1964. However, the trend was broken in 2009, when the Republican candidates swept all county row offices winning with an average margin of 20%.

Democrats have also made gains in Chester County state legislative seats in recent elections. Democrat Andy Dinniman picked up the 19th Senate District in May 2006 in the special election to replace the late Robert Thompson. Democrat Barbara McIlvaine Smith picked up the open 156th House district in November 2006, winning by only 28 votes and tipping the State-House majority to the Democrats. This was the first time that a Democrat had served part of Chester County as State Representative since Jim Gerlach (now serving the majority of the county in Congress) unseated Sam Morris in 1990. In 2008, two more open House seats in the county went Democratic---to Tom Houghton in the 13th and Paul Drucker in the 157th.


Chester County is administered by a three-person Board of Commissioners, who are elected for four-year terms, which take place in the year preceding US Presidential elections. The Commissioners have selective policy-making authority to provide certain local services and facilities on a county-wide basis. Accordingly, the commissioners are responsible for the management of the fiscal and administrative functions of the county.


Office Holder Party
County Commissioner (chairwoman) Carol Aichele Republican
County Commissioner Terrance Farrell Republican
County Commissioner Kathi Cozzone Democratic

Other elected officials

Office Holder Party
Clerk of Courts Teena Peters Republican
Controller Valentino F. DiGiorgio, III Republican
Coroner Robert O. Satriale Republican
District Attorney Joe Carroll Republican
Jury Commissioner Martha S. Smith Democratic
Jury Commissioner Mimi Sack Republican
Prothonotary Bryan Walters Republican
Recorder of Deeds Ryan Costello Republican
Register of Wills Paula Gowen Republican
Sheriff Carolyn Bunny Welsh Republican
Treasurer Alan Randzin Republican

United States House of Representatives

District Representative Party
6 Jim Gerlach Republican
7 Joe Sestak Democratic
16 Joseph R. Pitts Republican

United States Senate

Senator Party
Arlen Specter Democrat
Bob Casey Democrat

Pennsylvania House of Representatives

District Representative Party
13 Tom Houghton Democratic
26 Tim Hennessey Republican
155 Curt Schroder Republican
156 Barbara McIlvaine Smith Democratic
157 Paul Drucker Democratic
158 Chris Ross Republican
160 Stephen Barrar Republican
167 Duane Milne Republican
168 Tom Killion Republican

Pennsylvania State Senate

District Representative Party
9 Dominic F. Pileggi Republican
19 Andy Dinniman Democratic
26 Edwin Erickson Republican
36 Michael Brubaker Republican
44 John C. Rafferty, Jr. Republican
48 Mike Folmer Republican


Map of Chester County, Pennsylvania with Municipal Labels showing Cities and Boroughs (red), Townships (white), and Census-designated places (blue).
Under Pennsylvania law, there are four types of incorporated municipalities: cities, boroughs, townships, and, in at most two cases, towns. The post office uses community names and boundaries that usually do not correspond to the townships, and usually only have the same names as the municipalities for the cities and boroughs. The names used by the post office are generally used by residents to describe where they live. The following cities, boroughs and townships are located in Chester County:




Census-designated place

Census-designated places are geographical areas designated by the U.S. Census Bureau for the purposes of compiling demographic data. They are not actual jurisdictions under Pennsylvania law.


Colleges and universities

300 px

Public school districts

Independent schools

Library system

The Chester County Library System in southeastern Pennsylvania was organized in 1965. It is a federated system composed of a District Center Library in Exton and seventeen member libraries. The system provides materials and information for life, work and pleasure.

See also


External links

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