🇺🇸 603 area code
Area code 603 covers Manchester, Nashua, Portsmouth and Dover and the surrounding area in New Hampshire. Enter a 603 number below for a free check before you call back.
- Location: Manchester, New Hampshire
- Time zone: Eastern (UTC−5)
- In service since 1947
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Area code 603 at a glance
- Area code
- 603
- Location
- New Hampshire, United States
- Main cities
- Manchester, Nashua, Portsmouth, Dover, Salem, Exeter
- Time zone
- Eastern (UTC−5)
- Local time now
- —
- In service since
- 1947
- Local calls
- Dial 10 digits
- Number format
- (603) 555-0123
- From abroad
- +1 603 555 0123
Cities in area code 603
- Manchester
- Nashua
- Portsmouth
- Dover
- Salem
- Exeter
- Keene
- Laconia
- Concord
- Hampton
Is a 603 call a scam?
An area code tells you where a number was first assigned, not where the caller is. Mobile numbers keep their area code when people move, and internet (VoIP) numbers can be picked in any area code — so a 603 number can be calling from anywhere.
Robocallers exploit that with "neighbor spoofing": showing a 603 number to people in New Hampshire because a local-looking call is more likely to be answered. If a 603 call claims to be your bank, the IRS or a delivery company, hang up and call the official number yourself.
About area code 603
603 is one of the original North American area codes, created in 1947 when AT&T and the Bell System first divided the continent into numbering plan areas.
よくある質問
Area code 603 questions
Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.
Where is area code 603?
Area code 603 is in New Hampshire, United States. It covers Manchester, Nashua, Portsmouth, Dover, Salem and Exeter.
What time zone is area code 603?
603 is in the Eastern (UTC−5) time zone, and observes daylight saving time.
When did area code 603 start?
603 entered service in 1947.
How do I find out who called me from 603?
Enter the full number in the lookup at the top of this page. The free check confirms whether the number is valid and shows its carrier, line type and region; a full report adds owner and public-web records where they are available.
Why am I getting calls from area code 603?
If you live in or near New Hampshire, they may be genuinely local — or robocalls spoofing a local-looking number. Unknown 603 callers who will not leave a message are best looked up before you call back.