Wilmington Township is a township in Mercer County, Pennsylvania, United States. The population was 1,416 at the 2020 census, an increase from 1,415 in 2010.

Mercer County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 110,652. Its county seat is Mercer, and its largest city is Hermitage. The county is part of the Northwest Pennsylvania region of the state.