Parkman Township is one of the sixteen townships of Geauga County, Ohio, United States. As of the 2020 census the population was 4,446, up from 4,136 at the previous census. According to the 2020 "ACS 5-Year Estimates Data Profiles", 37.4% of the township's population spoke only English, while 62.6 spoke an "other Indo-European language".