Delaware County Ohio (Historic Districts) has 5 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include Elliott Hall, Sturges Library, And Merrick Hall, Highbanks Metropolitan Park Mounds I and II, Historic Northwest District, Sandusky Street Historic District and Warren Tavern Complex.
Prehistoric cultural affiliation(s) include Adena dating back to 999 BC.
Some of the country's most noteable architects helped create the Delaware County places including Gibbs, D.W., et al., Jones, R.N. and et al.. Prominent architectural styles found in Delaware Country are Gothic Revival, Greek Revival and Italianate.