There are 3 US Post Offices in Kimball County serving a total of 3,902 residents equating to 1,301 residents per post office. It's estimated that approximately 6,228 packages are handled across the 3 county post offices annually. Kimball County is a county located in the U.S. state of Nebraska. As of the 2010 census, the population was 3,821. Its county seat is Kimball. The county was formed in 1888 and named after railroad pioneer Thomas L. Kimball. In the Nebraska license plate system, Kimball County is represented by the prefix 71 (it was the county having the seventy-first-largest number of vehicles registered in the state when the license plate system was established in 1922)."