Watertown Auto Sales Used car dealer in Watertown, CT. Welcome to Watertown Auto Sales. We are a full service Connecticut used car dealer located in Watertown serving the towns of Litchfield County, Waterbury CT, Hartford CT, Torrington CT, Plymouth CT, Woodbury CT, Wolcott CT, Naugatuck CT, Bristol CT, Southbury CT, Prospect CT, Oxford CT, Cheshire CT, Seymour CT, New Milford CT and Meriden CT.