Johnson County /

Johnson County is a county located in the U.S. state of Nebraska. As of 2010, the population was 5,217. Its county seat is Tecumseh. In the Nebraska license plate system, Johnson County is represented by the prefix 57 (it had the fifty-seventh-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 377 square miles (976.4 km), of which 376 square miles (973.8 km) is land and 1 square mile (2.6 km) (0.18%) is water. Johnson County was formed in 1855. It was named after Vice President Richard M. Johnson. As of the census of 2000, there were 4,488 people, 1,887 households, and 1,254 families residing in the county. The population density was 12 people per square mile (5/km²). There were 2,116 housing units at an average density of 6 per square mile (2/km²). The racial makeup of the county was 93.54% White, 0.11% Black or African American, 0.40% Native American, 2.67% Asian, 0.02% Pacific Islander, 1.96% from other races, and 1.29% from two or more races. 2.87% of the population were Hispanic or Latino of any race. There were 1,887 households out of which 29.60% had