Area Code 603
Geographic details for North American area code 603.
Summary
Area code 603 is associated with Derry, Dover, East Concord, Keene, Manchester, Nashua, Portsmouth and Rochester, New Hampshire, United States.
About Area Code 603
Area code 603 is a North American telephone area code associated with Derry, Dover, East Concord, Keene, Manchester, Nashua, Portsmouth and Rochester in New Hampshire, United States. It is part of the North American Numbering Plan, which assigns three-digit codes to geographic areas across the United States, Canada and neighbouring territories.
The dataset lists 8 associated cities for area code 603, each with its own latitude and longitude. These city associations reflect the communities served by the numbering area when the data was compiled.
Area code 603 falls within New Hampshire. Area codes are assigned geographically, but because of number portability a phone number does not always stay in the region it was originally issued for.
The approximate centre of this numbering area is located at latitude 43.04894 and longitude -71.33472, placing it within New Hampshire. Coordinates are averaged from the associated city data and should be treated as a general reference point.
Area code 603 is one of hundreds of codes in the North American Numbering Plan. Codes are opened, split and overlaid by numbering administrators as demand changes, so city and region associations can shift over time.
Because of number portability, the current location of a phone number may differ from the area shown here. This page describes the area code assignment, not the physical location of an individual subscriber in United States.
Cities in Area Code 603
| City | State / Province | Region Code | Latitude | Longitude |
|---|---|---|---|---|
| Derry | New Hampshire | NH | 42.8806400 | -71.3272900 |
| Dover | New Hampshire | NH | 43.1978600 | -70.8736700 |
| East Concord | New Hampshire | NH | 43.2420200 | -71.5381300 |
| Keene | New Hampshire | NH | 42.9336900 | -72.2781400 |
| Manchester | New Hampshire | NH | 42.9956400 | -71.4547900 |
| Nashua | New Hampshire | NH | 42.7653700 | -71.4675700 |
| Portsmouth | New Hampshire | NH | 43.0717600 | -70.7625500 |
| Rochester | New Hampshire | NH | 43.3045300 | -70.9756200 |
Data Source
Area-code data is imported from Area Code Geolocation Database, a North American area-code geolocation database. GitHub.
This is a snapshot of an external open dataset, not a live telecom feed. Area-code boundaries and city associations may change over time, and number portability means an individual number may not be located where its area code suggests. Always confirm details with the relevant carrier or authority before relying on them.
Portability note: numbers can be moved between providers and regions, so an area code does not guarantee the caller's actual location.
Frequently Asked Questions
Where is area code 603 located?
Area code 603 is located in United States, within New Hampshire.
Which cities use area code 603?
Area code 603 is associated with Derry, Dover, East Concord, Keene, Manchester, Nashua, Portsmouth and Rochester.
Is an area code tied to a physical location?
No. Area codes are assigned geographically, but number portability means a phone number can move between regions and keep its original area code. The association shown here describes the area-code assignment, not a caller's current location.