Prehistoric cultural affiliation(s) include Early Woodland, Allison-Lamotte Culture and Mississippian dating back to 0.
Some of the country's most noteable architects helped create the Sullivan County places including O. H. Wheelock, John Bayard, F.J. Nicholas, Cuthbert J. Sherman, Wing & Manhurin, Walter Heath and G. W. Webster. Prominent architectural styles found in Sullivan Country are Beaux Arts, Late 19th And 20th Century Revivals and Late 19th Century.