Willow Grove is a census-designated place in Montgomery County, Pennsylvania, about 10 miles north of Philadelphia. The population was 16,234 at the 2000 census. It is the home of the Naval Air Station Willow Grove. Willow Grove was once best known for Willow Grove Park, a popular amusement park that was open from 1896 to 1976. Willow Grove apartments for rent comparison page shows most up to date rent information on Willow Grove apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.