Jo Daviess County Illinois (Historic Districts) has 4 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include Galena Historic District (Boundary Increase and Decrease), Galena Historic District, Scales Mound Historic District, Warren Commercial Historic District.
Some of the country's most noteable architects helped create the Jo Daviess County places including Adam Rittweger. Prominent architectural styles found in Jo Daviess Country are Greek Revival, Late Victorian and Classical Revival.