Burnett County is a county located in the U.S. state of Wisconsin. As of the 2020 census, the population was 16,526. Its county seat is Siren, with the majority of county governmental services located at the Burnett County Government Center. The county was created in 1856 and organized in 1865. The St. Croix Chippewa Indians of Wisconsin have reservation lands in Burnett County and are the county's largest employer.