The famous person Carl Cassel is associated with one of more of the Boone County historic places.
Some of the country's most noteable architects helped create the Boone County places including James B. Marsh, N.E. & Son Construction Co. Marsh, Bird & Rawson Proudfoot, Chicago & Northwestern Railroad, Gust Carlson, Iowa State Highway Commission, J.H. Sparks, T.C. Wardell, Iowa Bridge Co. and Marsh Engineering Co.. Prominent architectural styles found in Boone Country are Chicago, Queen Anne and Renaissance.