Area codes 203 and 475

area codes that serve the southwestern part of Connecticut

Area codes 203 and 475 are area codes for Connecticut. Area code 203 was one of the first area codes created in October 1947. It used to cover the entire state, but after it was split by 860 in 1995, it now covers the southwestern section of the state, typically in the Fairfield and New Haven counties. It was overlaid by area code 475 in 2009.