Willow Grove is a census-designated place (CDP) in Montgomery County, Pennsylvania, United States. A community in Philadelphia's northern suburbs, the population was 13,730 at the 2020 census. It is located in Upper Dublin Township, Abington Township and Upper Moreland Township. Willow Grove was once known for Willow Grove Park, an amusement park that was open from 1896 to 1976, now the site of Willow Grove Park Mall. Willow Grove is considered an edge city of Philadelphia, with large amounts of retail and office space.

Upper Dublin Township is a township in Montgomery County, Pennsylvania, United States. The population was 25,569 at the 2010 census. Until the 1950s, Upper Dublin was mostly farmland and open space, but transitioned to a residential suburb during the postwar population boom. The population went from just over 6,000 residents in the 1950s to just under 20,000 by 1970. Today, Upper Dublin is mostly spread-out development housing, and has the fourth highest median income in Montgomery County.