The Winthrop Mills Company Historic District was recently listed in the National Register of Historic Places for its local significance in association with the cotton and woolen textile industry in Winthrop, Maine in the 19th and 20th centuries. The complex, which contains two separate mills, and has eight total contributing historic resources, manufactured textiles with wool manufacturing in the larger complex adjacent to Main Street and cotton manufacturing in the smaller complex on Clark Street. The Winthrop Mills Company was established in 1866 and it was an important local industry employing many residents of the town . At one time it was the largest firm in the country exclusively producing woolen bed blankets and cotton warp. Over the course of the company?s history alterations and new construction replaced all of the earliest structures. Construction of the existing buildings runs from 1882 through the mid-20th century (with some modern additions in the latter half of the 20th century). As it stands today, this historic mill complex reflects nearly 150 years of textile manufacturing in Winthrop.