There are 6 US Post Offices in Dawson County serving a total of 24,004 residents equating to 4,001 residents per post office. It's estimated that approximately 38,313 packages are handled across the 6 county post offices annually. Dawson County is a county in the U.S. state of Nebraska. As of the 2010 census, the population was 24,326. Its county seat is Lexington. Dawson County is part of the Lexington, NE Micropolitan Statistical Area. In the Nebraska license plate system, Dawson County is represented by the prefix 18 (it had the eighteenth-largest number of vehicles registered in the county when the license plate system was established in 1922)."