Menominee County is a county in the U.S. state of Wisconsin. As of the 2020 census, the population was 4,255, making it the least populous county in Wisconsin. Its county seat is in the community of Keshena. Menominee is Wisconsin's newest county, having been created in 1959 after recognition of the Menominee tribe was terminated by federal law. In 1974, the tribe regained federal recognition and restoration of most of its reservation.