Liberty Township is one of the eighteen townships of Delaware County, Ohio, United States. The 2000 census reported a population of 15,429 in the township, 9,182 of whom lived in the unincorporated portions of the township. This was a significant in…Liberty Township is one of the eighteen townships of Delaware County, Ohio, United States. The 2000 census reported a population of 15,429 in the township, 9,182 of whom lived in the unincorporated portions of the township. This was a significant increase from the 1990 census, at which time its population was only 3,790. As of the 2010 census the population of the township was 26,172.