Penn Wynne is a census-designated place (CDP) in Montgomery County, Pennsylvania, United States. It is part of Lower Merion Township, and the mailing address is Wynnewood. The population was 5,697 at the 2010 census. It is mainly a residential area. The main arteries are Haverford Road and Manoa Road.

Lower Merion Township is a township in Montgomery County, Pennsylvania, United States. It is part of the Philadelphia Main Line. The township's name originates with the county of Merioneth in north Wales. Merioneth is an English-language transcription of the Welsh Meirionnydd.