Area Code 603 at a Glance
| Area code | 603 |
| Region | New Hampshire |
| Country | United States |
| Primary timezone | America/New_York |
| Dialing format | +1 (603) NXX-XXXX |
Cities and Places Using Area Code 603
Based on prefix-level carrier data, area code 603 covers places including:
- Manchester, NH
- Nashua, NH
- Portsmouth, NH
- Dover, NH
- Salem, NH
- Exeter, NH
- Keene, NH
- Laconia, NH
- Hampton, NH
- Rochester, NH
- Merrimack, NH
- Concord, NH
Frequently Asked Questions
Where is area code 603?
Area code 603 serves New Hampshire, United States.
Who is calling me from area code 603?
A call from area code 603 most likely originates from New Hampshire, but caller ID can be spoofed. If an unknown caller asks for personal or payment information, hang up and call the organization back on its official number.
How do I dial a 603 number?
Within North America: dial 1-603 followed by the 7-digit number. From abroad: your international prefix (like 00 or +), then 1 603 and the number.