There are 10 US Post Offices in Portage County serving a total of 58,770 residents equating to 5,877 residents per post office. It's estimated that approximately 93,803 packages are handled across the 10 county post offices annually. Portage County is a county in the U.S. state of Wisconsin. As of the 2010 census, the population was 70,019. Its county seat is Stevens Point. Portage County comprises the Stevens Point, WI Micropolitan Statistical Area and is included in the Wausau-Stevens Point-Wisconsin Rapids, WI Combined Statistical Area."