Browse the latest real estate listings in Columbia, Connecticut. Contact HST at 860-456-7653 or online with any questions or to schedule a private showing. Our CT realtors are ready to help you! Real estate in Columbia, CT consists mostly of single family homes. The residents in this 21 square mile community are dedicated to preserving its natural resources and retaining its rural character. The town is located on the outskirts of Tolland County. Columbia Lake is one of the most popular attractions. The summer season fills the lake and beach area with residents of all ages. Whether swimming, kayaking, sailing, or boating, Columbia Lake is guaranteed to bring sunshine and smiles to everyone who visits.