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Killingworth is a town in Middlesex county in Connecticut. It was formed in 1667. Killingworth is a part of the Killingworth probate district and has been since 1834. Saybrook was/were the previous chronological district or districts. For more information, contact the county at 323 Rte. 81 Killingworth 06417-1298. On the attached map, Middlesex is located at F5.
For information about the state of Connecticut see Connecticut Family History Research.