There are 10 US Post Offices in Newton County serving a total of 78,625 residents equating to 7,863 residents per post office. It's estimated that approximately 125,494 packages are handled across the 10 county post offices annually. Newton County is a county located in the southwest portion of the U.S. state of Missouri. As of the 2010 census, the population was 58,114. Its county seat is Neosho. The county was organized in 1838 and is named in honor of John Newton, a hero who fought in the Revolutionary War. Newton County is part of the Joplin, MO Metropolitan Statistical Area."