Sac County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 9,814. The county seat is Sac City. Both were named for the Sauk people, a local Native American tribe. In February 2007, in its third annual list of the “Best Places to Live in Rural America”, Progressive Farmer magazine placed Sac County as#7 in the overall rankings. In 2009, the magazine ranked Sac County as the tenth "Best Place" in the Midwest Region.