Area Code 603
Area code 603 covers Manchester and nearby cities including Nashua, Derry, Dover in New Hampshire, in the Eastern Time.
Area code 603 quick facts
| Location | Manchester, New Hampshire |
|---|---|
| Time zone | Eastern Time |
| In service | 1947-01-01 |
| Nearby codes | 351, 978, 339, 781, 617, 857 |
| Carrier coverage | 752 prefixes; 39% wireless |
| FTC complaint data | 469 complaints across 89 numbers |
| Data current as of | August 2, 2026 |
Is a call from 603 a scam? Who called me from 603?
FTC complaints involving 603 numbers
Numbers shown with area code 603 in the FTC's Do Not Call “Reported Calls” database (recent reporting window). Most common reported reasons: “Other”, “Dropped call or no message”, “No Subject Provided”.
Most-complained 603 numbers:
- (603) 633-5042 — 19 complaints
- (603) 570-4474 — 16 complaints
- (603) 207-4386 — 14 complaints
- (603) 202-3699 — 13 complaints
- (603) 704-3119 — 13 complaints
These are FTC Do Not Call complaints filed about specific numbers shown with this area code — frequently spoofed. The area code itself is not a scam. See the most-reported area codes and the most-reported phone numbers nationwide.
Cities in area code 603
Manchester, Nashua, Derry, Dover, East Concord, Keene, Portsmouth, Rochester
Area codes by city
Carriers in area code 603
Area code 603 spans 752 prefixes, about 39% wireless. Top carriers: CONSOLIDATED COMM OF NO. NEW ENGLAND-NH, BELL ATLANTIC MOBILE, INC, OMNIPOINT MIAMI E LICENSE, LLC, PAETEC ITEL, LLC. Look up the carrier and line type for a 603 number.
Nearby area codes
Frequently asked questions
Where is area code 603?
Area code 603 covers Manchester and nearby cities including Nashua, Derry, Dover in New Hampshire, in the Eastern Time.
What cities use area code 603?
Area code 603 serves Manchester, Nashua, Derry, Dover, East Concord, and 3 other communities in New Hampshire.
What time zone is area code 603 in?
Area code 603 is in the Eastern Time (America/New_York).
How do you dial a 603 number?
Dial all 10 digits: 603 followed by the 7-digit local number. From abroad, dial +1 603 and the local number.
Is a call from area code 603 a scam?
A 603 number is geographically tied to New Hampshire, but caller ID can be spoofed, so the displayed area code does not prove where a caller really is. If you did not expect the call, do not share personal information and consider looking the number up.
Is 603 a country code?
No. 603 is a US area code (a domestic 3-digit code), not a country code. The country (calling) code for the United States is +1, shared across the North American Numbering Plan. So a full 603 number written for international dialing looks like +1 603 followed by the 7-digit local number.
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of August 2, 2026. Refreshed monthly.