The Hudson Historic District includes most of downtown Hudson, New York, United States, once called "one of the richest dictionaries of architectural history in New York State". It is a 139-acre (56 ha) area stretching from the city's waterfront on the east bank of the Hudson River to almost its eastern boundary, with a core area of 45 blocks. It has 756 contributing properties, most of which date from the city's founding in 1785 to the mid-1930s. In 1985 it was listed on the National Register of Historic Places.