Area code 603 is the sole area code serving the entire state of New Hampshire, making it unique in its singular coverage. One of the original area codes established in 1947, it covers a largely rural and suburban state known for its scenic beauty, small-town communities, and historic cities like Concord and Manchester. Seven-digit dialing is still common. Area code 603 is a powerful symbol of New Hampshire pride, simplicity, and independent spirit, often used in branding and local identity to evoke a close-knit and traditional New England feel.
Locations for Area Code - 603
Browse all cities and areas that belong to this area code.
Derry
- State: NH
- Population: 22,015
- Latitude: 42.88064, Longitude: -71.32729
- Elevation: 84 m
Dover
- State: NH
- Population: 30,880
- Latitude: 43.19786, Longitude: -70.87367
- Elevation: 19 m
East Concord
- State: NH
- Population: 43,976
- Latitude: 43.20814, Longitude: -71.53757
- Elevation: 83 m
Keene
- State: NH
- Population: 23,265
- Latitude: 42.93369, Longitude: -72.27814
- Elevation: 148 m
Manchester
- State: NH
- Population: 110,229
- Latitude: 42.99564, Longitude: -71.45479
- Elevation: 80 m
Nashua
- State: NH
- Population: 87,970
- Latitude: 42.76537, Longitude: -71.46757
- Elevation: 49 m
Portsmouth
- State: NH
- Population: 21,530
- Latitude: 43.07704, Longitude: -70.75766
- Elevation: 6 m
Rochester
- State: NH
- Population: 30,038
- Latitude: 43.30453, Longitude: -70.97562
- Elevation: 70 m
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