page_title: Delaware County, Pennsylvania
section_title: United States House of Representatives
hierarchical_section_title: Delaware County, Pennsylvania / Politics and government / United States House of Representatives
caption_attribution_description: English: Pennsylvania congressional district 5
context_page_description: Delaware County, colloquially referred to as Delco, is a county located in the U.S. state of Pennsylvania that borders Philadelphia. With a population of 566,747, it is the fifth most populous county in Pennsylvania, and the third smallest in area. The county was created on September 26, 1789, from part of Chester County, and named for the Delaware River.
  Its county seat is Media. Until 1850, Chester was the county seat of Delaware County and, before that, of Chester County.
  Delaware County is adjacent to the city-county of Philadelphia and is included in the Philadelphia–Camden–Wilmington, PA–NJ–DE–MD Metropolitan Statistical Area. Delaware County is the only county covered in its entirety by area codes 610 and 484.
caption: The 2018 congressional map ordered by the Supreme Court of Pennsylvania places all of Delaware County within the new 5th congressional district.
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