There are 7 US Post Offices in Butler County serving a total of 7,548 residents equating to 1,078 residents per post office. It's estimated that approximately 12,047 packages are handled across the 7 county post offices annually. Butler County is a county in the U.S. state of Nebraska. As of the 2010 census, the population was 8,395. Its county seat is David City. The county was created in 1856 and organized in 1868. In the Nebraska license plate system, Butler County is represented by the prefix 25 (when the license plate system was established in 1922, it had the 25th-largest number of vehicles registered in the county). In 2010, Nebraska's center of population was in Butler County, near the village of Rising City."