Prospect Park is a borough in Delaware County, Pennsylvania, United States. The population was 6,454 at the2010 census.
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. A plaque on the outside of the church announces the birthplace of the phrase.The Morton Homestead, one of the oldest buildings in Pennsylvania, was listed on the National Register of Historic Places in 1970.