Westbrook is a town in Middlesex County, Connecticut, United States. The town is part of the Lower Connecticut River Valley Planning Region. The population was 6,769 at the 2020 census. The town center is classified by the U.S. Census Bureau as a census-designated place (CDP).
Westbrook lies in the shoreline area of the state. The town is bordered by the towns of Essex, Clinton, Deep River, and Old Saybrook, where the Connecticut River empties into Long Island Sound. The Salt Meadow Unit of the Stewart B. McKinney National Wildlife Refuge is located in town.
According to the United States Census Bureau, the town has a total area of , of which, is land and (26.47%) is water. The Westbrook Center CDP has a total area of of which 22.33% is water.
Westbrook encompasses three islands in Long Island Sound, all of which are uninhabited. Salt Island is the easternmost and smallest, at approximately 0.9 acres. Menunketesuck Island, which is the largest of Westbrook's i