List of Connecticut area codes
The U.S. state of Connecticut is divided into two numbering [plan area]s, each configured as an overlay complex of two area codes each.
| Area code | Year created | Parent NPA | Overlay | Numbering plan area |
| Area [code 203|203] | 1947 | – | 203/475 | Southwestern Connecticut |
| 475 | 2009 | 203 | 203/475 | Southwestern Connecticut |
| 860 | 1995 | 203 | 860/959 | Northern and eastern Connecticut |
| 959 | 2014 | 860 | 860/959 | Northern and eastern Connecticut |