Connecticut Zip Code Listings 2016. At 5,543 square miles, Connecticut is the 48th largest state in America. Administratively Connecticut is divided into 169 cities and towns and eight counties: Fairfield, Hartford, Litchfield, Middlesex, New Haven, New London, Tolland, and Windham. The state's population in 2013 was 3,596,080, according to the 2013 United States Census, making it the 29th most populous state in America. As of January 2014, the state has roughly 433 zip codes, which are listed below with the respective city, town, village or location name as well as the area code.