| General Information about Area Code 203 | |
|---|---|
| Country | United States |
| State / Province / Territory | Connecticut |
| Major City | New Haven |
| Time Zone | Eastern (UTC-05:00) |
| Prefix | Primary City | County | Phone Type |
|---|---|---|---|
| 203-578 | Waterbury | New Haven | Landline |
| 203-674 | Stamford | Fairfield | Landline |
| 203-577 | Waterbury | New Haven | Landline |
| 203-980 | New Haven | New Haven | Wireless |
| 203-736 | Ansonia | New Haven | Landline |
| 203-698 | Old Greenwich | Fairfield | Landline |
| 203-732 | Ansonia | New Haven | Landline |
| 203-945 | Norwalk | Fairfield | Landline |
| 203-260 | Bridgeport | Fairfield | Wireless |
| 203-847 | Norwalk | Fairfield | Landline |
| 203-777 | New Haven | New Haven | Landline |
| 203-276 | Stamford | Fairfield | Landline |
| 203-871 | Branford | New Haven | Landline |
| 203-819 | Waterbury | New Haven | Landline |
| 203-259 | Fairfield | Fairfield | Landline |
| 203-906 | Ansonia | New Haven | Wireless |
| 203-208 | Branford | New Haven | Landline |
| 203-973 | Stamford | Fairfield | Landline |
| 203-589 | New Haven | New Haven | Wireless |
| 203-407 | Hamden | New Haven | Landline |