Delaware County, Pennsylvania

Delaware County, Pennsylvania
County	Delaware County
State	Pennsylvania
Founded	September 26, 1789
Seat	Media
Largest city	Chester
Area total sq mi	191.11
Area land sq mi	184.59
Area water sq mi	6.52
Population as of	2020
Population total	576830
Population density sq mi	3125.0

Delaware County, Pennsylvania is a county located in the southeastern part of the Commonwealth of Pennsylvania, within the Philadelphia metropolitan area. It was officially formed on September 26, 1789, from portions of Chester County and is named for the Delaware River which forms its eastern border. The county seat is Media, while its most populous city is the historically significant industrial hub of Chester.

History

The area that is now Delaware County was originally inhabited by the Lenape people before European settlement began in the 17th century under the auspices of New Sweden. Following the arrival of William Penn and the establishment of the Province of Pennsylvania, the region became part of Chester County. Significant early events include the Battle of Brandywine during the American Revolutionary War, which was fought nearby. The county's formal creation in 1789 was driven by the growth of settlements like Chester and Darby. Throughout the 19th and 20th centuries, it transformed from an agricultural region into a major industrial and residential suburb, home to historic companies like the Baldwin Locomotive Works and the Sun Shipbuilding & Drydock Company.

Geography

According to the U.S. Census Bureau, the county has a total area of 191.11 square miles, of which 184.59 square miles is land and 6.52 square miles is water. Its eastern boundary is defined by the Delaware River, separating it from New Jersey, and it is bordered by Montgomery County to the north, Philadelphia to the east, and Chester County to the west. The topography includes parts of the Atlantic coastal plain, with significant waterways like Darby Creek and Ridley Creek. Notable parks include Ridley Creek State Park and the John Heinz National Wildlife Refuge at Tinicum, which protects the largest freshwater tidal marsh in Pennsylvania.

Demographics

As of the 2020 United States census, the population was 576,830, making it the fifth-most populous county in Pennsylvania. The racial makeup is diverse, with significant populations of Irish, Italian, German, and African American ancestry. The county has seen steady growth since the mid-20th century, driven by suburban expansion from Philadelphia. Major population centers include Upper Darby Township, Haverford Township, and the city of Chester. Educational attainment levels are high, with a large percentage of residents holding bachelor's degrees or higher.

Economy

Historically dominated by heavy manufacturing and shipbuilding, Delaware County's economy has diversified into sectors like healthcare, education, and corporate services. Major employers include the Crozer-Keystone Health System, Widener University, and Pennsylvania State University's Brandywine Campus. The Philadelphia International Airport, though located in Philadelphia, is a significant regional economic engine bordering the county. Corporate headquarters and offices are found in towns like Radnor, home to SAP America, and Springfield. The Sunoco refinery in Marcus Hook remains a key industrial facility.

Government and politics

Delaware County operates under a Home Rule Charter with a County Council form of government, led by a County Executive. It is part of Pennsylvania's 5th congressional district, represented in the U.S. House by Mary Gay Scanlon. The county has historically been a political battleground, trending Democratic in recent presidential elections, though local offices are often contested. It falls under the jurisdiction of the Court of Common Pleas for the 32nd Judicial District of Pennsylvania. The county sheriff oversees court security and civil process duties.

Education

Primary and secondary education is provided by over a dozen public school districts, including the William Penn School District and the Rose Tree Media School District. Notable private institutions include the Episcopal Academy in Newtown Square and the Delaware County Christian School. Higher education is anchored by Widener University in Chester, which includes the Widener University School of Law, and Pennsylvania State University's Brandywine Campus in Media. Other institutions include Delaware County Community College and Neumann University in Aston Township.

Transportation

Major highways serving the county include Interstate 95, the Blue Route (Interstate 476), and U.S. Route 1. Public transportation is managed by the Southeastern Pennsylvania Transportation Authority (SEPTA), providing extensive bus, trolley, and regional rail service, including the Media/Wawa Line and the Airport Line. The Philadelphia International Airport is immediately adjacent to the county line. Important rail infrastructure includes Amtrak's Northeast Corridor and freight lines operated by CSX Transportation. The Commodore Barry Bridge connects the county to New Jersey over the Delaware River.

Category:Delaware County, Pennsylvania Category:Counties of Pennsylvania Category:Philadelphia metropolitan area