Gray County is a county located in the U.S. state of Kansas. Its county seat and most populous city is Cimarron. As of the 2020 census, the county population was 5,653. The county was named after Alfred Gray, a 19th century Kansas politician.

Cimarron is a city in and the county seat of Gray County, Kansas, United States. As of the 2020 census, the population of the city was 1,981. It is located along Highway 50.