The Florence Mill stands on the site of an earlier mill at 121 West Main Street in Vernon’s industrial village of Rockville. The original mill was built in 1831 by Colonel Francis McLean, in partnership with Alonzo Bailey. Framing from the old Vernon meeting house was used in its construction. Called the Frank Mill, it produced cassimere (cashmere). It was replaced by a new mill building in 1847, but this burned down in 1853 and the company collapsed. Nathaniel O. Kellogg purchased the factory’s remains and started a new company. He built the Florence Mill in 1864, Rockville‘s first example of slow-burn construction: brick masonry exterior walls with wood timber frames. The mill closed in 1869 and continued as a woolen mill under other owners until White, Corbin & Company converted it for the manufacture of envelopes in 1881. In that year, it was described as the largest brick building in Rockville. The company later consolidated with others to form the U.S. Envelope Company in 1898. The factory closed in the 1970s and was converted to become senior housing.
