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Derby is a town in New Haven county in Connecticut. It was formed in 1675. Derby is a part of the Derby probate district and has been since 1858. New Haven was/were the previous chronological district or districts. For more information, contact the county at City Hall 35 Fifth St. Derby 06418-1897. On the attached map, New Haven is located at C6.
For information about the state of Connecticut see Connecticut Family History Research.