Monadnock Mills, Historic textile district in Claremont, US

Monadnock Mills is a historic mill complex on the southern bank of the Sugar River in Claremont, New Hampshire, running on both sides of Water Street between the Broad Street bridge and the junction of Main and Water Streets, with a few surviving elements on the north bank opposite. Its oldest building is the four-story Mill Number 1 of 1836; Mill Number 2, on the north bank, dates to 1853. The mills were listed on the National Register of Historic Places in 1979, and many buildings have been repurposed.

The Sugar River Manufacturing Company was chartered by New Hampshire in 1831 to make cotton and woolen textiles. Its oldest surviving building, the four-story Mill Number 1, dates to 1836, followed by nearby tenement houses. New owners enlarged the complex in 1843 and operations began the next year; the company was renamed Monadnock Mills in 1846 and ran until 1963.

The mill buildings show how workers shaped the economic life of the region daily and distributed their products across the nation. These structures remind visitors that people labored and lived here, and their craftsmanship helped build American industry.

The complex runs along the southern bank of the Sugar River on both sides of Water Street, from the Broad Street bridge east to the junction of Main and Water Streets west, with a few surviving elements on the north bank opposite. The buildings are no longer under single ownership, so most are seen from the surrounding public streets.

The complex was the largest manufacturing site in the upper Connecticut River watershed and among its oldest. The company kept the Monadnock Mills name from 1846 until it stopped operating in 1963, and the site received a Manufacturing Leadership sustainability award in 2016 and an FSC Leadership Award in 2017.