- Land Area: 573 square miles
- Population (2000): 7039
- County Seat: Clay Center
- Towns and Population (2000): Clay Center, 861; Deweese, 80; Edgar, 539; Fairfield, 467; Glenvil, 332; Harvard, 998; Ong, 67; Saronville, 61; Sutton, 1,447; Trumbull, 212
- Public School Districts: Clay Center Public Schools, Clay Center; Harvard Public Schools, Harvard; Sandy Creek Public Schools; Sutton Public Schools, Sutton
- Private School Districts: Sutton Christian Schools, Sutton
- Clay County Quick Facts: U.S. Census Bureau
- Maps: Various County Maps
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