DERBY, a city of New Haven county, Connecticut, U.S.A., 10 m. W. of New Haven, on the Housatonic river at the mouth of the Naugatuck, just below Ansonia and opposite the borough of Shelton. The population was 11,238 in 192o (32% f oreign born white), and was 10,788 in 193o by the Federal census. Derby was settled in 1643 as an Indian trading post called Paugasset, and received its present name in 1675. It was chartered as a city in 1893. In the i8th century it had a thriving commerce with the West Indies. It was the birthplace of David Humphreys (1752– '818), Washington's aide and military secretary from 178o to the end of the war, first minister of the United States to Portugal (179o-97) and minister to Spain (1797-18o2), and one of the "Hartford Wits"; and of Commodore Isaac Hull (1773-1843), commander of the U.S. frigate "Constitution" ("Old Ironsides") during the War of 1812.