Ansonia ănsōˈnēə [key], city (2020 pop. 18,918), New Haven co., SW Conn., on the Naugatuck River; inc. as a city 1893. Its manufactures include brass and copper products, iron castings, foundry products, plastics, and electronic devices. Settled in 1651 as part of Derby, Ansonia was founded (1844) as an industrial community by Anson G. Phelps, a metals merchant and philanthropist.

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