New Hampshire Area Codes
Directory of all 1 telephone area codes assigned to New Hampshire.
New Hampshire phone numbers are served by 1 area code operating in the Eastern timezone.10-digit or 7-digit local dialing applies depending on the exact number. No area codes in New Hampshire are currently flagged as high-risk scams.
Most populated prefix: area code 603 (New Hampshire)
All Area Codes in New Hampshire
Major Cities Served by New Hampshire Area Codes
The most populous urban centers and census places covered by New Hampshire's area codes, ranked by population.
New Hampshire Area Code FAQs
Quick answers to common questions about New Hampshire telephone area codes.
How many area codes does New Hampshire have?
New Hampshire has 1 area codes: 603.
What timezone do New Hampshire area codes use?
New Hampshire area codes operate in the Eastern timezone.
What is the most populated area code in New Hampshire?
Area code 603 is the most populous prefix in New Hampshire based on covered city population.
Does New Hampshire use overlay area codes?
New Hampshire currently has no overlay code pairs listed in our directory.
Are there scam area codes in New Hampshire?
New Hampshire has no area codes currently flagged as high-risk scams.
About New Hampshire Area Codes & Phone Dialing Rules
When placing calls within New Hampshire, ten-digit dialing (area code + 7-digit telephone number) is required in overlay regions where multiple area codes serve the same geographic boundaries.