Prehistoric cultural affiliation(s) include Late Woodland and Late Archaic dating back to 1000.
The famous person Caswell,L.B. and et al. is associated with one of more of the Jefferson County historic places.
Some of the country's most noteable architects helped create the Jefferson County places including Julius E. Heimerl, John J. Wollet, John J. & Son Flad, Joseph Kern, Charles Rockwell, Claude & Starck, Charles Archie, Louis Charboneau and H.C. & Son Kohn. Prominent architectural styles found in Jefferson Country are Italianate, Late Victorian and Queen Anne.