There are 10 US Post Offices in Callaway County serving a total of 43,122 residents equating to 4,312 residents per post office. It's estimated that approximately 68,828 packages are handled across the 10 county post offices annually. Callaway County is a county located in the U.S. state of Missouri. As of the 2010 United States Census, the county's population was 44,332. Its county seat is Fulton. The county was organized November 25, 1820, and named for Captain James Callaway, grandson of Daniel Boone. Callaway County is also referred to as \"The Kingdom of Callaway\" after an incident in which residents confronted Union troops during the U.S. Civil War. Callaway County is part of the Jefferson City, MO Metropolitan Statistical Area. Vineyards and wineries were first established in the area by German immigrants in the 19th century. Since the 1960s, there has been a revival of winemaking throughout the state. The Callaway Nuclear Generating Station is located in Callaway County."