Land Area: 575 square miles Population (2000): 5,786 County Seat: Nelson Towns and Population (2000): Hardy, 206; Lawrence, 323; Nelson, 627; Nora, 24; Oak, 68; Ruskin, 187; Superior, 2,397. Public School Districts: South Central Nebraska Unified System 5, (Sandy Creek and Lawrence/Nelson) and Superior Private School Districts: Sacred Heart Elementary School, Lawrence. Nuckolls County Quick Facts: U.S. Census Bureau