There are 8 US Post Offices in Ashland County serving a total of 16,944 residents equating to 2,118 residents per post office. It's estimated that approximately 27,045 packages are handled across the 8 county post offices annually. Ashland County is a county located in the U.S. state of Wisconsin. As of the 2010 census, the population was 16,157. Its county seat is Ashland. The county was formed on March 27, 1860, from La Pointe County.