There are 15 US Post Offices in Sauk County serving a total of 70,888 residents equating to 4,726 residents per post office. It's estimated that approximately 113,145 packages are handled across the 15 county post offices annually. Sauk County is a county in the U.S. state of Wisconsin. It is named after a large village of the Sauk people. As of the 2010 census, the population was 61,976. Its county seat and largest city is Baraboo. The county was created in 1840 from Wisconsin Territory and organized in 1844. Sauk County comprises the Baraboo, WI Micropolitan Statistical Area and is included in the Madison-Janesville-Beloit, WI Combined Statistical Area."