Anderson County is a county located in East Central Kansas, in the Central United States. Its county seat and most populous city is Garnett. As of the 2020 census, the county population was 7,836. The county was named for Joseph C. Anderson, a Kansas territorial legislator and border ruffian during the "Bleeding Kansas" era.

Garnett is a city in and the county seat of Anderson County, Kansas, United States. As of the 2020 census, the population of the city was 3,242.