Kaycee is a town in Johnson County, Wyoming, United States. The population was 263 at the 2010 census. It is home to a museum that preserves the cattle ranching heritage of the area, especially the history of the Johnson County War.
Kaycee was incorporated in 1906 after the establishment of a small post office and general store. The town was named after the brand "KC" used by its earliest homesteader, John Nolan. The government required the name to be spelled out resulting in "Kaycee". The town is now home to three churches, two bars, one restaurant, one store, one museum, one K-12 school, and not a single stoplight.
Western music star and rodeo champion Chris LeDoux resided on a ranch near Kaycee, although he was born in Biloxi, Mississippi.
Former NCAA Division III track and field athlete Noah Elm was born and raised in Kaycee.
Wyoming State Treasurer Mark Gordon was reared on the Gordon Ranch near Kaycee. Gordon is owner of the Merlin Ranch east of Buffalo and is affiliated with the 48 Ranch Partnership in Kaycee.