Prehistoric cultural affiliation(s) include Transitional, Late Woodland and Late Archaic dating back to 1499 BC.
Many famous people are associated with these Washington County historic places including Lemuel Haynes, William Miller, Benjamin Williams, Judge Joseph Potter, Julia Baker and Salem Town.
Some of the country's most noteable architects helped create the Washington County places including Louis A. Simon, Ephraim Clapp, John B. Jarvis, George Picken, Axel Horn, Milton Stevens, Benjamin Wright, Almon Chandler Hopson, Shepperd Norcross and Caleb Brown. Prominent architectural styles found in Washington Country are Federal, Greek Revival and Late Victorian.