Owen County is a county in the U.S. state of Indiana. In 1920 the United States Census Bureau calculated the mean center of U.S. population to fall within this county. As of the 2010 United States Census, the population was 21,575. The county seat is Spencer.Owen County is part of the Bloomington, Indiana, Metropolitan Statistical Area.

Putnam County is a county in the U.S. state of Indiana. As of the 2010 United States Census, the population was 37,963. The county seat is Greencastle. The county was named for Israel Putnam, a hero in the French and Indian War and a general in the American Revolutionary War. The county was created in 1821 and organized in April 1822.Putnam County is included in the Indianapolis-Carmel-Anderson, IN Metropolitan Statistical Area.

Greene County is a county in the U.S. state of Indiana. As of 2010, the population was 33,165. The county seat is Bloomfield. The county was determined by the US Census Bureau to include the mean center of U.S. population in 1930.

Danville is a city in and the county seat of Vermilion County, Illinois. As of the 2010 census, its population was 33,027. As of 2019, the population was an estimated 30,479.