There are 11 US Post Offices in Vilas County serving a total of 22,361 residents equating to 2,033 residents per post office. It's estimated that approximately 35,691 packages are handled across the 11 county post offices annually. Vilas County is a county in the state of Wisconsin, United States. As of the 2010 census, the population was 21,430. Its county seat is Eagle River."