There are 10 US Post Offices in Christian County serving a total of 77,794 residents equating to 7,779 residents per post office. It's estimated that approximately 124,168 packages are handled across the 10 county post offices annually. Christian County is a county located in the southwestern part of the U.S. state of Missouri. As of the 2010 census, the population was 77,422. Its county seat is Ozark. The county was organized in 1859 and is named after William Christian, a Kentucky soldier of the American Revolutionary War. Christian County is part of the Springfield, MO Metropolitan Statistical Area. Between 2000 and 2010, it was the fastest growing county in Missouri and one of the fastest growing in the nation as the county became more suburban due to the booming growth in Springfield."