Torrington, CT. Online Offers. Torrington is the largest city in Litchfield County, Connecticut and the northwestern Connecticut region. It is also the core city of the largest micropolitan area in the United States. The city population was 36,383 according to the 2010 census. Torrington is a former mill town, as are most other towns along the Naugatuck River Valley. It is currently competing with the neighboring city of Winsted to recreate a pleasant Main Street environment.