Rush County is a county located in the U.S. state of Kansas. Its county seat and largest city is La Crosse. As of the 2020 census, the county population was 2,956. The county was named for Alexander Rush.

La Crosse is a city in and the county seat of Rush County, Kansas, United States. As of the 2020 census, the population of the city was 1,266. La Crosse proclaims itself the "Barbed Wire capital of the world.