Ansonia is a city in New Haven County, Connecticut, United States. Located on the Naugatuck River, it is gruffly north of Derby, and approximately 12 miles (19 km) northwest of New Haven. The population was 18,918 at the get older of the 2020 census. The ZIP code for Ansonia is 06401. The city is served by the Metro-North Railroad. Ansonia Station is a stop on the railroad passenger commuter service’s Waterbury Branch connecting to New York’s Grand Central Terminal. Ansonia with is served by the Connecticut Transit bus carrier. Connecticut Route 8 serves Ansonia (Northbound, Exit 18; Southbound, Exit 19).

Ansonia, also referred to as “The Copper City”, is attributed for its records of heavy machine manufacturing industry in the belittle Naugatuck Valley. Production included copper, brass, rubber and plastics processing, molding and tubing, iron castings, sheet metal, electric, automatic screw machine, textiles, and foundry products. The well-known Ansonia Clock Company was founded here in 1851.

Ansonia is the birthplace of David Humphreys, a diplomat and colonel in the American Revolutionary War.

The area along the Naugatuck River, comprising the gift Elm Street section of Ansonia and Derby Avenue section of Derby, was first established by English colonists in 1652; it was originally a allocation of the township of Derby. Early settlers developed subsistence farming, and used the river for sawmills and gristmills.