A mill was first constructed at the site of the future Hockanum Mill on the Hockanum River in Rockville in Vernon in 1814 by Bingham & Nash. The mill produced satinet, a finely woven fabric that resembles satin but is made from wool. New owners acquired the mill in 1821 and soon expanded it by constructing a mirror image of the earlier building. These became known as the Twin Mills. The Hockanum Company was formed in 1836. They built new and larger mill was built on the site in 1849. After it burned down in 1854, it was rebuilt the following year to the same design. A wood-frame Greek Revival structure on a brick basement, it is the only wood-framed mill building surviving in Rockville. In 1881, the Hockanum Company built a three and a half story brick Romanesque Revival building, adjacent to the original wooden structure.
After George Maxwell became president of the company in 1869, he converted the mill’s production over to a higer-quality worsted cloth for menswear. By the turn-of-the-century the company was booming under the presidency of George Sykes. It produced the cloth for the inaugural suit worn by President William H. McKinley in 1897. The Hockanum Mill consolidated with three other Rockville mills in 1906 forming the Hockanum Mills Company, which was sold to M.T. Stevens in 1934. The Rockville mills were shut down in 1951. The Hockanum Mill recently received funds from the state to assist in the cleanup and reuse of the building for commercial and light industrial purposes. The site is also planned to be the home of the proposed New England Motorcycle Museum.