About Rose Valley, Pennsylvania
Historical Places, Historic, Interesting Places, Historic Settlements
Rose Valley is a small, historic borough in Delaware County, Pennsylvania, United States. Its area is 0.73 square miles (1.9 km2), and the population was 913 at the 2010 census. The area was settled by Quaker farmers in 1682, and later water mills along Ridley Creek drove manufacturing in the nineteenth century.