The Waterloo Historic District encompasses the site of one of the first mills on the Warner River, near the Waterloo Falls in Warner, New Hampshire. The 50-acre (20 ha) district includes most of the original 60-acre (24 ha) land grant for the mill site. It extends along Waterloo Street and Newmarket Street for a length of about 1 mile (1.6 km), from where Newmarket Street crosses the Warner River to where Waterloo Street crosses a brook. In addition to its industrial history, the district is notable for being home to two nationally known politicians: William E. Chandler (1835-1917), who served as United States Senator and as United States Secretary of the Navy, and Nehemiah G. Ordway (1828-1907), the seventh governor of the Dakota Territory.