North Star is a village in Darke County, Ohio, United States. The population was 224 at the 2020 census. North Star was platted in 1852 along the road between Greenville and Celina, approximately midway between the two cities. Its name was derived from its location on the edge of the Great Black Swamp, as it was the northernmost point in Darke …North Star is a village in Darke County, Ohio, United States. The population was 224 at the 2020 census. North Star was platted in 1852 along the road between Greenville and Celina, approximately midway between the two cities. Its name was derived from its location on the edge of the Great Black Swamp, as it was the northernmost point in Darke County that was not wetland.