Hanover Township is one of the eighteen townships of Columbiana County, Ohio, United States. The 2020 census reported 3,459 people living in the township.

Columbiana County is a county located in the U.S. state of Ohio. As of the 2020 census, the population was 101,877. The county seat is Lisbon and its largest city is Salem. Created in 1803, the county name is derived from that of 15th-century Italian explorer Christopher Columbus.