There are 10 US Post Offices in Bayfield County serving a total of 12,623 residents equating to 1,262 residents per post office. It's estimated that approximately 20,148 packages are handled across the 10 county post offices annually. Bayfield County is a county located in the U.S. state of Wisconsin on the Canada\u2013United States border. As of the 2010 census, the population was 15,014. Its county seat is Washburn. The county was created in 1845 and organized in 1850."