Neapolis, OhioNeapolis is a census-designated place in northwestern Providence Township, Lucas County, Ohio, United States. As of the 2020 census it had a population of 497. It has a post office, with the ZIP code of 43547.HistoryNeapolis was laid out in 1872. The community was named after Neapolis, in Ancient Greece. A post office called Neapolis has been in operation since 1873.