Haddam is a town in Middlesex County, Connecticut, United States. The town is part of the Lower Connecticut River Valley Planning Region. The population was 8,452 at the time of the 2020 census. It is the only town in Connecticut that the Connecticut River runs through the middle of instead of at the town's border edge. The town was also home to the now-de…Haddam is a town in Middlesex County, Connecticut, United States. The town is part of the Lower Connecticut River Valley Planning Region. The population was 8,452 at the time of the 2020 census. It is the only town in Connecticut that the Connecticut River runs through the middle of instead of at the town's border edge. The town was also home to the now-decommissioned Connecticut Yankee Nuclear Power Plant.
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