Lincoln Center, more commonly known as Lincoln, is a city in and the county seat of Lincoln County, Kansas, United States. As of the 2020 census, the population of the city was 1,171.

K-18 is a 206-mile (332 km), west–east state highway in the U.S. State of Kansas. K-18's western terminus is at U.S. Route 24 (US-24) near Bogue and the eastern terminus is at K-99 south of Wamego. Portions of the highway have been upgraded to a freeway beginning in 2012.