El Codigo de Area 603 incluye localidades dentro de NEW HAMPSHIRE.
Las localidades con Codigo de Area 603 mas populares son: 1) Claremont. 2) Meredith. 3) Dunbarton. 4) Bretton Woods. 5) Nashua. 6) Candia. 7) Danbury. 8) Hanover. 9) Madison. 10) Epping.
En la siguiente tabla se muestran las localidades con Codigo de Area 603.
| Localidad | Condado | Estado | Codigo de Area |
|---|---|---|---|
| NORTH WOODSTOCK | NEW HAMPSHIRE | Codigo 603 | |
| NORTHWOOD | NEW HAMPSHIRE | Codigo 603 | |
| ORFORD | NEW HAMPSHIRE | Codigo 603 | |
| PELHAM | NEW HAMPSHIRE | Codigo 603 | |
| PENACOOK | NEW HAMPSHIRE | Codigo 603 | |
| PETERBOROUGH | NEW HAMPSHIRE | Codigo 603 | |
| PIERMONT | NEW HAMPSHIRE | Codigo 603 | |
| PIKE | NEW HAMPSHIRE | Codigo 603 | |
| PITTSBURG | NEW HAMPSHIRE | Codigo 603 | |
| PITTSFIELD | NEW HAMPSHIRE | Codigo 603 | |
| PLAINFIELD | NEW HAMPSHIRE | Codigo 603 | |
| PLAISTOW | NEW HAMPSHIRE | Codigo 603 | |
| PLYMOUTH | NEW HAMPSHIRE | Codigo 603 | |
| PORTSMOUTH | NEW HAMPSHIRE | Codigo 603 | |
| RAYMOND | NEW HAMPSHIRE | Codigo 603 | |
| RINDGE | NEW HAMPSHIRE | Codigo 603 | |
| ROCHESTER | NEW HAMPSHIRE | Codigo 603 | |
| RUMNEY | NEW HAMPSHIRE | Codigo 603 | |
| RYE BEACH | NEW HAMPSHIRE | Codigo 603 | |
| SALEM | NEW HAMPSHIRE | Codigo 603 | |
| SALISBURY | NEW HAMPSHIRE | Codigo 603 | |
| SANBORNVILLE | NEW HAMPSHIRE | Codigo 603 | |
| SEABROOK | NEW HAMPSHIRE | Codigo 603 | |
| SOMERSWORTH | NEW HAMPSHIRE | Codigo 603 | |
| SOUTH HAMPTON | NEW HAMPSHIRE | Codigo 603 | |
| SPOFFORD | NEW HAMPSHIRE | Codigo 603 | |
| SULLIVAN | NEW HAMPSHIRE | Codigo 603 | |
| SUNAPEE | NEW HAMPSHIRE | Codigo 603 | |
| SUNCOOK | NEW HAMPSHIRE | Codigo 603 | |
| SUTTON | NEW HAMPSHIRE | Codigo 603 | |
| TAMWORTH | NEW HAMPSHIRE | Codigo 603 | |
| TILTON | NEW HAMPSHIRE | Codigo 603 | |
| TROY | NEW HAMPSHIRE | Codigo 603 | |
| TWIN MOUNTAIN | NEW HAMPSHIRE | Codigo 603 | |
| WALPOLE | NEW HAMPSHIRE | Codigo 603 | |
| WARNER | NEW HAMPSHIRE | Codigo 603 | |
| WARREN | NEW HAMPSHIRE | Codigo 603 | |
| WASHINGTON | NEW HAMPSHIRE | Codigo 603 | |
| WEARE | NEW HAMPSHIRE | Codigo 603 | |
| WEST CHESTERFIELD | NEW HAMPSHIRE | Codigo 603 | |
| WEST LEBANON | NEW HAMPSHIRE | Codigo 603 | |
| WEST STEWARTSTOWN | NEW HAMPSHIRE | Codigo 603 | |
| WESTMORELAND | NEW HAMPSHIRE | Codigo 603 | |
| WHITEFIELD | NEW HAMPSHIRE | Codigo 603 | |
| WILTON | NEW HAMPSHIRE | Codigo 603 | |
| WINCHESTER | NEW HAMPSHIRE | Codigo 603 | |
| WOLFEBORO | NEW HAMPSHIRE | Codigo 603 | |
| WOODSVILLE | NEW HAMPSHIRE | Codigo 603 |