Kossuth County Iowa has 8 places on the National Register of Historic Places including 3 places of Statewide significance. Significant places include Des Moines River Bridge, Land and Loan Office Building and Longbottom Polygonal Barn, Algona Junior and Senior High School Building and High School Building Annex and Dau, William C. and Hertha, House.
Some of the country's most noteable architects helped create the Kossuth County places including James B. Marsh, Louis H. Sullivan, Ben Longbottom, C. Black, Oswald Thorson and George L. Miller. Prominent architectural styles found in Kossuth Country are International Style, Late 19th And Early 20th Century American Movements and Moderne.