603 Area Code — Manchester, NH
Area code 603 serves Manchester and 4 other cities in New Hampshire. Local time follows America/New_York. It has no overlay codes.
- State
- New Hampshire
- Primary city
- Manchester
- Timezone
- America/New_York
- In service since
- 1947
- Type
- Geographic
- Overlay codes
- None
Cities Served by 603
The 603 area code covers 5 cities and communities in New Hampshire.
- Manchester
- Nashua
- Concord
- Dover
- Portsmouth
About Area Code 603
Area code 603 is a North American Numbering Plan (NANP) area code that has been in service since 1947. It is administered by NANPA on behalf of the FCC and serves the New Hampshire region anchored on Manchester.
603 is currently a single-coverage geographic area code with no overlays. This means a 7-digit number in this area code is unique within its rate centers, though best-practice is always to dial the full 10-digit number when contacting a 603 line.
Mobile numbers in 603 are portable: a person who moved away from Manchester may still carry a 603 mobile number on their device. If you receive an unexpected call from a 603 number, run it through the reverse lookup tool above for the most accurate, free identification.
If you live or do business in New Hampshire, you may also interact with neighbouring or overlay codes. See the related codes section below to explore the rest of New Hampshire.
603 Area Code FAQ
Where is area code 603?
Area code 603 is located in New Hampshire, primarily serving Manchester and surrounding cities including Nashua, Concord, Dover. The region operates on ET (America/New_York) time.
What state is 603 area code?
603 is a New Hampshire area code. It was put into service in 1947 and has no overlay codes — it covers its geographic area exclusively.
Is 603 a scam area code?
603 is a legitimate North American area code allocated by NANPA to New Hampshire. Like any geographic area code, scammers sometimes spoof 603 numbers — judge each call by content (urgent demands, unfamiliar transfers) rather than the area code alone. Run the specific number through our reverse lookup if you're unsure.
What time zone does 603 use?
Area code 603 operates on ET (America/New_York). Numbers in this area code follow standard New Hampshire time-zone rules including any daylight-saving transitions for that region.
Can I look up a specific 603 phone number?
Yes. Use the reverse lookup widget above to enter a full 603 number. NumLocation returns the line type (mobile, landline, VoIP), carrier, rate-center city, and any public listings tied to the number — free.