Old Saybrook is a town in Middlesex County, Connecticut, United States. The population was 10,242 at the 2010 census. It contains the incorporated borough of Fenwick, as well as the census-designated places of Old Saybrook Center and Saybrook Manor.
According to the United States Census Bureau, the town has a total area of 21.6 square miles (56.0 km²), of which, 15.0 square miles (39.0 km²) of it is land and 6.6 square miles (17.0 km²) of it (30.45%) is water.
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