603 Area Code
New Hampshire, USA
Local time now · Eastern Time
3:45 AM
Area code 603 is in New Hampshire, USA, serving Manchester, Nashua, Concord and Derry. It uses Eastern Time — the time there now is 3:45 AM. In service since 1947.
| Area code | 603 |
|---|---|
| Location | New Hampshire, USA |
| Major cities | Manchester, Nashua, Concord, Derry, Dover, Rochester, Merrimack, Londonderry |
| Time zone | Eastern Time |
| In service since | 1947 |
| Dialing | 1+10 digit permissible at service provider discretion. |
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Frequently asked questions
Where is area code 603?
New Hampshire, USA — including Manchester, Nashua, Concord, Derry and Dover.
What time zone is area code 603?
Eastern Time.
How do I call a 603 number from abroad?
Dial your international access code, then 1 (the country code), then 603 and the 7-digit number — for example +1 603 555 0100. From the UK or India dial 00 1 603 …; from Bangladesh 00 1 603 … .
Is a call from 603 a scam?
Not by itself — 603 is an ordinary geographic area code in New Hampshire. Numbers can be spoofed, so be careful with unexpected calls asking for money or personal details.
Sources: North American Numbering Plan Administrator (NANPA) NPA database (10/25/2026); major cities from Wikidata (CC0). An area code shows where a number was first assigned — with number portability and mobile phones, the caller may be anywhere.