There are 4 US Post Offices in Perkins County serving a total of 2,932 residents equating to 733 residents per post office. It's estimated that approximately 4,680 packages are handled across the 4 county post offices annually. Perkins County is a county in the U.S. state of Nebraska. As of the 2010 census, the population was 2,970. Its county seat is Grant. In the Nebraska license plate system, Perkins County is represented by the prefix 74 (it had the seventy-fourth-largest number of vehicles registered in the county when the license plate system was established in 1922)."