Newtown Township, also referred to by the name of its post office of Newtown Square, is a township in Delaware County, Pennsylvania, United States. Prior to 1789, it was part of Chester County. As of the 2020 census, the population was 15,002.

Delaware County, colloquially referred to as Delco, is a county in the Commonwealth of Pennsylvania. With a population of 576,830 as of the 2020 census, it is the fifth-most populous county in Pennsylvania and the third-smallest in area. The county was created on September 26, 1789, from part of Chester County and named for the Delaware River. The county is part of the Southeast Pennsylvania region of the state.