Several famous people are associated with these De Kalb County historic places including Joseph Farwell Glidden, Isaac Leonard Ellwood, William Wallace Marsh and George H. Gurler.
Some of the country's most noteable architects helped create the De Kalb County places including Fellows & Hamilton Perkins, George O. Garnsey, Jacob Haish, Elmer F. Behrens, Israel Doan, W.H. Ashelford, James Knox Taylor, Skogland & Wedberg, Matthew Nisbet and Cortland & Chicago R.R. Co. Sycamore. Prominent architectural styles found in De Kalb Country are Italianate, Greek Revival and Art Deco.