Washington County New York (Historic Districts) has 9 places on the National Register of Historic Places including 1 place of National significance and 2 places of Statewide significance. Significant places include Miller, William, Farm Historic District (Boundary Increase), Champlain Canal and Miller, William, Chapel and Ascension Rock, Cambridge Historic District and Hudson Falls Historic District.
The famous person William Miller is associated with one of more of the Washington County historic places.
Some of the country's most noteable architects helped create the Washington County places including John B. Jarvis, Benjamin Wright, Almon Chandler Hopson and A. R. Griffin. Prominent architectural styles found in Washington Country are Greek Revival, Federal and Late Victorian.