Columbia is a community of about 5,000 residents covering 21.9 sq. miles: the kind of place where everybody knows your name. Its convenient access to Routes 2 (via Rte. 66), 384 (via Rte. 6) and 84 (via Rte. 195), and its proximity to Manchester, Hartford, and Norwich, make it an ideal community for commuters,combining the charms of small town rural life with easy access to the amenities of larger towns. State of Connecticut: Town of Columbia.