Sac County is a county located in the U.S. state of Iowa. As of the 2010 census, the population was 10,350. The county seat is Sac City.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.