There are 6 US Post Offices in Adams County serving a total of 24,256 residents equating to 4,043 residents per post office. It's estimated that approximately 38,715 packages are handled across the 6 county post offices annually. Adams County is a county in the U.S. state of Wisconsin. As of the 2010 census, the population was 20,875. Its county seat is Friendship. The county was created in 1848 and organized in 1853. Sources differ as to whether its name is in honor of the second President of the United States, John Adams, or his son, the sixth President, John Quincy Adams."