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.

Kansas is a landlocked state in the Midwestern region of the United States. It borders Nebraska to the north; Missouri to the east; Oklahoma to the south; and Colorado to the west. Kansas is named after the Kansas River, in turn named after the Kansa people. Its capital is Topeka, and its most populous city is Wichita, however the largest urban area is the bi-state Kansas City, MO–KS metropolitan area.