The U.S. state of Connecticut is divided into two numbering plan areas, each configured as an overlay complex of two area codes each.
Area code Yearcreated ParentNPA Overlay Numbering plan area 203 1947 – 203/475 Southwestern Connecticut (Fairfield County (except for Sherman); New Haven County, and the towns of Bethlehem, Woodbury, as well as a small part of Roxbury in Litchfield County) 475 2009 203 860 1995 203 860/959 Northern and eastern Connecticut 959 2014 860
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