There are 12 US Post Offices in Vernon County serving a total of 21,012 residents equating to 1,751 residents per post office. It's estimated that approximately 33,537 packages are handled across the 12 county post offices annually. Vernon County is a county located in west central Missouri. As of the 2010 census, the population was 21,159. Its county seat is Nevada. The county was organized on February 27, 1855 and was named for Col. Miles Vernon (1786\u20131867), a state senator and veteran of the Battle of New Orleans."