Cedar County is a county in the U.S. state of Nebraska. As of the 2010 census, the population was 8,852. Its county seat is Hartington. The county was formed in 1857 and named for the many cedars that grow there.In the Nebraska license plate system, Cedar County is represented by the prefix 13 (it had the 13th-largest number of vehicles registered in the county when the license plate system was established in 1922).GeographyAccording to the U.S. Census Bureau, the county has an area of, of which is land and (0.7%) is water.Major highways 20px U.S. Highway 20 20px U.S. Highway 81 20px Nebraska Highway 12 20px Nebraska Highway 15 20px Nebraska Highway 57 20px Nebraska Highway 59 20px Nebraska Highway 84 20px Nebraska Highway 121
