Jefferson County Kansas has 7 places on the National Register of Historic Places including 5 places of Statewide significance. Significant places include Delaware River Composite Truss Bridge, Delaware River Parker Truss Bridge, Jefferson Old Town Bowstring Truss, Meriden Rock Creek Bridge and Union Block.
Some of the country's most noteable architects helped create the Jefferson County places including Missouri Valley Bridge & Iron, King Iron Bridge Co., Midland Bridge Co. and H. M. Hadley. Prominent architectural styles found in Jefferson Country are Italianate.