There are 9 US Post Offices in Buffalo County serving a total of 27,224 residents equating to 3,025 residents per post office. It's estimated that approximately 43,453 packages are handled across the 9 county post offices annually. Buffalo County is a county in the U.S. state of Nebraska. As of the 2010 census, the population was 46,102, making it Nebraska's fifth-most populous county. Its county seat is Kearney. The county was created in 1855 and later organized in 1870. It was named after the then-prevalent buffalo herds. Buffalo County is part of the Kearney, NE Micropolitan Statistical Area. In the Nebraska license plate system, Buffalo County is represented by the prefix 9; when the license plate system was established in 1922, the county ranked ninth in number of registered vehicles."