Passaic County New Jersey (Historic Districts) has 10 places on the National Register of Historic Places including 3 places of National significance and 3 places of Statewide significance. Significant places include Great Falls of Paterson/S.U.M. Historic District, Great Falls of the Passaic and Society for Useful Manufactures Historic District (Boundary Increase), Ringwood Manor, Botany Worsted Mills Historic District and Long Pond Ironworks.
Some of the country's most noteable architects helped create the Passaic County places including Pierre Charles L'Enfant, Ephraim Morris, Ephraim Beach, Welch, Smith & Provot, et al., Ludwig Kick, John Mervin Carrere and Fred Wesley Wentworth. Prominent architectural styles found in Passaic Country are Colonial Revival, Beaux Arts and Classical Revival.