203 area code is the telephone area code of the North American Numbering Plan (NANP) in Connecticut, United States of America. It was one of the original area codes created in 1947 and covered of Southwestern Connecticut (Bridgeport, Danbury, New Haven, Waterbury).
| Area Code | 203 |
|---|---|
| Major City | Bridgeport |
| Service Date | 01/01/1947 |
| Time Zone | Eastern |
| Overlay Complex | 203/475 |
| Location | Connecticut (CT) |
| Country | United States |
The service date for which area code 203 was assigned began on January 1, 1947. The code has one overlay (475) which was added in 2009 as demand increased.
| Area Code | City/Town | County |
|---|---|---|
| 203 | Ansonia | New Haven County |
| 203 | Avon | Hartford County |
| 203 | Beacon Falls | New Haven County |
| 203 | Bethany | New Haven County |
| 203 | Bethel | Fairfield County |
| 203 | Bethlehem | Litchfield County |
| 203 | Botsford | Fairfield County |
| 203 | Branford | New Haven County |
| 203 | Bridgeport | Fairfield County |
| 203 | Bristol | Hartford County |
| 203 | Cheshire | New Haven County |
| 203 | Cos Cob | Fairfield County |
| 203 | Danbury | Fairfield County |
| 203 | Darien | Fairfield County |
| 203 | Derby | New Haven County |
| 203 | East Haven | New Haven County |
| 203 | Easton | Fairfield County |
| 203 | Fairfield | Fairfield County |
| 203 | Georgetown | Fairfield County |
| 203 | Glastonbury | Hartford County |
| 203 | Granby | Hartford County |
| 203 | Greens Farms | Fairfield County |
| 203 | Greenwich | Fairfield County |
| 203 | Guilford | New Haven County |
| 203 | Hamden | New Haven County |
| 203 | Hartford | Hartford County |
| 203 | Hawleyville | Fairfield County |
| 203 | Killingworth | Middlesex County |
| 203 | Madison | New Haven County |
| 203 | Meriden | New Haven County |
| 203 | Middlebury | New Haven County |
| 203 | Middlefield | Middlesex County |
| 203 | Middletown | Middlesex County |
| 203 | Milford | New Haven County |
| 203 | Milldale | Hartford County |
| 203 | Monroe | Fairfield County |
| 203 | Naugatuck | New Haven County |
| 203 | New Canaan | Fairfield County |
| 203 | New Fairfield | Fairfield County |
| 203 | New Haven | New Haven County |
| 203 | New Milford | Litchfield County |
| 203 | Newtown | Fairfield County |
| 203 | North Branford | New Haven County |
| 203 | North Haven | New Haven County |
| 203 | Northford | New Haven County |
| 203 | Norwalk | Fairfield County |
| 203 | Oakdale | New London County |
| 203 | Old Greenwich | Fairfield County |
| 203 | Orange | New Haven County |
| 203 | Oxford | New Haven County |
| 203 | Prospect | New Haven County |
| 203 | Redding Center | Fairfield County |
| 203 | Redding Ridge | Fairfield County |
| 203 | Ridgefield | Fairfield County |
| 203 | Riverside | Fairfield County |
| 203 | Sandy Hook | Fairfield County |
| 203 | Seymour | New Haven County |
| 203 | Shelton | Fairfield County |
| 203 | South Britain | New Haven County |
| 203 | Southbury | New Haven County |
| 203 | Southport | Fairfield County |
| 203 | Stamford | Fairfield County |
| 203 | Stevenson | Fairfield County |
| 203 | Stratford | Fairfield County |
| 203 | Trumbull | Fairfield County |
| 203 | Wallingford | New Haven County |
| 203 | Waterbury | New Haven County |
| 203 | West Hartford | Hartford County |
| 203 | West Haven | New Haven County |
| 203 | Weston | Fairfield County |
| 203 | Westport | Fairfield County |
| 203 | Wilton | Fairfield County |
| 203 | Wolcott | New Haven County |
| 203 | Woodbridge | New Haven County |
| 203 | Woodbury | Litchfield County |