There are 2 US Post Offices in Blaine County serving a total of 320 residents equating to 160 residents per post office. It's estimated that approximately 511 packages are handled across the 2 county post offices annually. Blaine County is a county in the U.S. state of Nebraska. As of the 2010 census, the population was 478, making it Nebraska's second-least populous county and the sixth-least populous in the United States. Its county seat is Brewster. The county was formed in 1885 and organized in 1886. It is named after presidential candidate James G. Blaine. In the Nebraska license plate system, Blaine County is represented by the prefix 86 (it had the eighty-sixth-largest number of vehicles registered in the county when the license plate system was established in 1922)."