Elwyn is an unincorporated community in the Philadelphia-Camden metropolitan area. Elwyn is in Middletown Township, Delaware County, Pennsylvania, USA. Middletown Township had a population of 16,000 in the 2000 census. Elwyn has a latitude of 39.907N, longitude of -75.41W and an elevation of 253 feet above sea level.
Elwyn is home to Elwyn Inc., a facility caring for the needs of the developmentally disabled and disadvantaged.
Elwyn is named for Dr. Alfred L. Elwyn, a physician who founded The Pennsylvania Training School for Idiotic and Feeble-minded Children in 1854 with teacher James B. Richards.