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Derby was settled in 1642 as an Indian trading post under the name Paugasset. It was named after Derby, England in 1675.
Derby Probate District covers Towns of Derby and Ansonia. Constituted 4 July 1858 from New Haven.
Libraries and Historical Societies
ReferencesAdjacent towns: New Haven Co.: Ansonia | Orange | Seymour | Fairfield Co.: Shelton