🇺🇸 United States · New Hampshire

Area code 603

Area code 603 is a telephone area code in New Hampshire, United States, covering Manchester, Nashua, Portsmouth, Dover, Salem, Keene and more. Local time is UTC−5 (UTC−4 in summer). Numbers look like (603) 234-5678, or +1 603 234 5678 from abroad.

State: New Hampshire
Time zone: New York UTC−5 (UTC−4 in summer)
Local time now: –
Dial from abroad: +1 603

Places in area code 603

Cities and towns with telephone exchanges in the 603 area code, most exchanges first.

Manchester
Nashua
Portsmouth
Dover
Salem
Keene
Exeter
Laconia
Merrimack
Rochester
Lebanon
Hampton
Moultonborough
Concord
Plaistow
Derry
Bedford
Claremont
Hanover
Durham
Colebrook
Winchester
Belmont
Meredith

How to dial area code 603

Calling from	You dial
Inside the 603 area	603 234 5678 (10 digits)
Elsewhere in the US & Canada	1 603 234 5678
Any mobile phone, anywhere	+1 603 234 5678
UK, Europe, India and most countries	00 1 603 234 5678
Australia	0011 1 603 234 5678

Area code 603: FAQ

Where is area code 603?

Area code 603 is in New Hampshire, United States and serves Manchester, Nashua, Portsmouth, Dover, Salem, Keene. and other places

What time zone is area code 603 in?

Area code 603 is in the America/New_York time zone (UTC−5 (UTC−4 in summer)).

How do I call a 603 number from outside the US and Canada?

Dial your exit code (00 in most countries, or + on a mobile), then 1, then 603 and the seven-digit number. Example: +1 603 234 5678.

Is a call from area code 603 a scam?

Area code 603 is a regular North American area code, but caller ID can be spoofed: scammers often show local-looking numbers. Do not call back unknown numbers that ask for money or personal data, and check the number with the phone number validator to see whether it is valid and whether it is a mobile, landline or VoIP number.

Phone number API

Check 603 numbers in your app

numlookupapi checks any phone number worldwide in one request and returns validity, line type, carrier, location and every standard format as JSON.

Read the documentation

100 free requests every month. No credit card required.

GET https://api.numlookupapi.com/v1/validate/+16032345678

{
  "valid": true,
  "number": "12069220880",
  "local_format": "2069220880",
  "international_format": "+12069220880",
  "country_prefix": "+1",
  "country_code": "US",
  "country_name": "United States of America",
  "location": "Seattle",
  "line_type": "landline",
  "e164_format": "+12069220880",
  "national_format": "(206) 922-0880"
}