Prospect Park is a borough in Delaware County, Pennsylvania, United States. The population was 6,454 at the 2010 census, down from 6,594 at the 2000 census. It originated as a bedroom community of Philadelphia. It is located within 10 miles (16 km) of Center City, Philadelphia, with convenient rail access (SEPTA, and connection to Amtrak).
In 1874, John Cochran of Chester purchased 103 acres from Joshua Pierson with the intention of dividing the property into lots and selling them. These properties formed the current community of Prospect Park.
Prospect Hill Baptist Church in Prospect Park claims a prominent role in instituting the phrase "In God We Trust" on United States coins and currency. A former pastor, Mark R. Watkinson, felt that the Civil War was going to leave the country with a bad name, "brother fighting brother in a civil war", and wrote a letter to Salmon P. Chase, Secretary of the Treasury, suggesting "God, Liberty, Law," be put on the coins. Chase referred the matter to James B. Longacre, Mint Engraver. A committee later settled on "In God We Trust", and the words first appeared on a 2-cent coin.