Osborne County is a county located in the U.S. state of Kansas. It county seat and largest city is Osborne. As of the 2020 census, the county population was 3,500. The county is named for Vincent Osborne, a captain in the American Civil War.

Smith County is a county located in the U.S. state of Kansas. Its county seat is Smith Center. As of the 2020 census, the population was 3,570. The county is named in memory of J. Nelson Smith, a major in the 2nd Colorado Cavalry, killed at the Battle of Westport on October 21, 1864. The geographic center of the contiguous United States is located within the county, near Lebanon.