El Codigo de Area 203 incluye localidades dentro de CONNECTICUT.
Las localidades con Codigo de Area 203 mas populares son: 1) New Haven. 2) Danbury. 3) Norwalk. 4) Meriden. 5) Bridgeport. 6) New Canaan. 7) Greenwich. 8) Naugatuck. 9) Cheshire. 10) Darien.
En la siguiente tabla se muestran las localidades con Codigo de Area 203.
| Localidad | Condado | Estado | Codigo de Area |
|---|---|---|---|
| ANSONIA-DERBY | CONNECTICUT | Codigo 203 | |
| BRANFORD | CONNECTICUT | Codigo 203 | |
| BRANFORD THIMBLE ISLANDS | CONNECTICUT | Codigo 203 | |
| BRIDGEPORT | CONNECTICUT | Codigo 203 | |
| BYRAM | CONNECTICUT | Codigo 203 | |
| CHESHIRE | CONNECTICUT | Codigo 203 | |
| DANBURY | CONNECTICUT | Codigo 203 | |
| DARIEN | CONNECTICUT | Codigo 203 | |
| FAIRFIELD | CONNECTICUT | Codigo 203 | |
| GEORGETOWN | CONNECTICUT | Codigo 203 | |
| GREENWICH | CONNECTICUT | Codigo 203 | |
| GUILFORD | CONNECTICUT | Codigo 203 | |
| HUNTINGTON | CONNECTICUT | Codigo 203 | |
| MADISON | CONNECTICUT | Codigo 203 | |
| MERIDEN | CONNECTICUT | Codigo 203 | |
| MILFORD | CONNECTICUT | Codigo 203 | |
| NAUGATUCK | CONNECTICUT | Codigo 203 | |
| NEW CANAAN | CONNECTICUT | Codigo 203 | |
| NEW HAVEN | CONNECTICUT | Codigo 203 | |
| NEWTOWN | CONNECTICUT | Codigo 203 | |
| NORWALK | CONNECTICUT | Codigo 203 | |
| OLD GREENWICH | CONNECTICUT | Codigo 203 | |
| REDDING | CONNECTICUT | Codigo 203 | |
| RIDGEFIELD | CONNECTICUT | Codigo 203 | |
| SEYMOUR | CONNECTICUT | Codigo 203 | |
| STAMFORD | CONNECTICUT | Codigo 203 | |
| TRUMBULL | CONNECTICUT | Codigo 203 | |
| WALLINGFORD | CONNECTICUT | Codigo 203 | |
| WATERBURY | CONNECTICUT | Codigo 203 | |
| WESTPORT | CONNECTICUT | Codigo 203 | |
| WILTON | CONNECTICUT | Codigo 203 | |
| WOLCOTT | CONNECTICUT | Codigo 203 | |
| WOODBURY | CONNECTICUT | Codigo 203 |