Hamilton County /

Hamilton County is a county located in the U.S. state Nebraska. The county was named for Alexander Hamilton, the first Secretary of the Treasury. As of 2010, the population was 9,124, a decline of 3 percent from the population of 9,403 in 2000. Its county seat is Aurora. In the Nebraska license plate system, Hamilton County is represented by the prefix 28 (it had the twenty-eighth-largest number of vehicles registered in the county when the license plate system was established in 1922). According to the U.S. Census Bureau, the county has a total area of 547 square miles (1,416.7 km), of which 544 square miles (1,409.0 km) is land and 3 square miles (7.8 km) (0.57%) is water. Hamilton County was formed in 1867. It was named after Alexander Hamilton. As of the census of 2000, there were 9,403 people, 3,503 households, and 2,676 families residing in the county. The population density was 17 people per square mile (7/km²). There were 3,850 housing units at an average density of 7 per square mile (3/km²). The racial makeup of the county was 98.43% White, 0.18% Black or African American, 0.12% Native American, 0.22% Asian, 0.49% from other races, and 0.56% from two or more races. 1.14%