Ridley Park is a borough in Delaware County, Pennsylvania, United States. The population was 7,002 at the 2010 census. Ridley Park is the home of The Boeing Company's CH-47 Chinook helicopter division.
The Lenape inhabited the Delaware River region several centuries before the arrival of European explorers and traders. The Okehocking Tribe of the Lenni Lenape Nation established small permanent villages along the river and its main tributaries. Land adjacent to Stoney Creek in Ridley Township has been identified as a Native American town site. Historians also believe that additional villages may have existed at other locations along Stoney Creek and Crum Creek in Ridley Park. Native Americans significantly influenced the built environment through their network of paths laid out for travel and communication purposes. Their footpaths through the densely forested countryside grew into the first roads of the area. Chester Pike is believed to have developed from a footpath created by the Lenni Lenape as their main thoroughfare in the area.
The borough is named after a place in Cheshire, England. John Morton, signer of the American Declaration of Independence, was born and raised in a log cabin adjacent to East Ridley Avenue.