Woodlyn is a census-designated place (CDP) in Delaware County, Pennsylvania, United States. The population was 9,485 at the 2010 census, down from 10,036 at the 2000 census. It is a part of Ridley Township, and children residing within the community generally attend schools in the Ridley School District. Woodlyn is served by the Woodlyn Fire Co. for fire, rescue and EMS services.

Ridley Township is a township in Delaware County, Pennsylvania, United States. The population was 30,768 at the 2010 census. Ridley Township contains the (CDPs) of Folsom and Woodlyn, along with the unincorporated communities of Crum Lynne and Holmes and a portion of Secane.