York County is a county in the U.S. state of Nebraska. As of the 2010 census, the population was 13,665. Its county seat is York.In the Nebraska license plate system, York County is represented by the prefix 17 (it had the seventeenth-largest number of vehicles registered in the county when the license plate system was established in 1922).HistoryYork County was organized in 1870. Sources differ on the origin of the county's name: some state it was named after York in England, while others maintain it was named by early settlers from York County, Pennsylvania.GeographyAccording to the U.S. Census Bureau, the county has a total area of, of which is land and (0.6%) is water.Major highways 20px Interstate 80 20px U.S. Highway 34 20px U.S. Highway 81 20px Nebraska Highway 69