Folsom is a census-designated place (CDP) in Delaware County, Pennsylvania, United States. It is part of Ridley Township, Pennsylvania. The population was 8,072 at the 2000 census.
Folsom is located at 39°53′31″N 75°19′34″W / 39.89194°N 75.32611°W / 39.89194; -75.32611 (39.891978, -75.326231).
According to the United States Census Bureau, the CDP has a total area of 1.2 square miles (3.2 km²), all of it land.