🇺🇸USA State Guide: New Hampshire

New Hampshire
Area Code
603

Connecting to the Granite State? Reach Manchester, Nashua, or the White Mountains instantly. One state, one code (603). Crystal clear VoIP calls directly from your browser.

Dialing Rules
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How to Call New Hampshire

New Hampshire follows standard US dialing procedures.

1

Exit Code

If calling from abroad, dial your country's exit code (e.g., 00 for Europe).

2

US Code (+1)

Dial +1. This is the country code for the USA.

3

Area Code (603)

Dial 603 followed by the 7-digit number.

The Single Code State

New Hampshire is one of the few states with a single area code: 603. However, you must still dial the full 10 digits (603 + Number) for all calls.

New Hampshire City Codes

All cities use the 603 area code.

CityCountyArea Code
ManchesterHillsborough603
NashuaHillsborough603
ConcordMerrimack603
DoverStrafford603
RochesterStrafford603
CityCountyArea Code
KeeneCheshire603
PortsmouthRockingham603
LaconiaBelknap603
LebanonGrafton603
BerlinCoos603

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Local Presence

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Time Zones

New Hampshire is in the Eastern Time Zone (ET).

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Fast

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Frequently Asked Questions

What is the area code for New Hampshire?

New Hampshire uses a single area code: 603. It covers the entire state.

What time is it in New Hampshire?

New Hampshire is in the Eastern Time Zone (UTC-5), the same as New York.

Can I call New Hampshire cell phones?

Yes, StartACall allows you to call both landlines and mobile phones in New Hampshire for the same low rate.

Is 603 the only area code?

Yes, 603 is currently the only area code serving New Hampshire, making it one of the few states with a single code.

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The 603 State: Dialing New Hampshire from Overseas Without Guesswork

In short

New Hampshire has used a single area code since the numbering plan began, which removes one common dialing error entirely. This guide covers what statewide 603 means for callers abroad, the shift to ten-digit dialing, Eastern Time scheduling from Europe and Asia, and how mobiles are billed.

One Code from the Seacoast to the Notches

Manchester, Nashua, Concord, Portsmouth, Keene, and the North Country all share 603, assigned in 1947 and never divided. Whether you are calling a business on the Massachusetts border or a lodge in the White Mountains, the code is the same.

New Hampshire residents have adopted 603 as shorthand for the state itself, and it appears in brand names and event titles. For international callers the single code eliminates the most common failure mode in US dialing, picking the wrong area code for a city.

A population of about 1.4 million and careful number conservation have kept 603 viable far longer than forecasters once expected. Overlay planning has been raised and shelved more than once as reclaimed number blocks stretched the supply, so the single code era continues for now.

Full Ten Digits, Even Locally

New Hampshire moved to mandatory ten-digit local dialing as part of the nationwide changes surrounding the 988 short code. Residents now dial 603 plus seven digits for every call, which matches the format you need from abroad after the country code.

From outside North America the full sequence is exit code, 1, 603, then the seven-digit number. On a mobile handset, entering the number as +1 603 and seven digits works from every country and avoids memorizing exit codes altogether. It also survives travel between countries untouched.

The single code pattern holds across northern New England. Vermont runs entirely on 802 and Maine on 207, so the tri-state corner is one of the last American regions where one code per state remains the rule, and a wrong-state guess is immediately visible in the digits.

Eastern Time Makes Europe Easy

New Hampshire follows US Eastern Time, five hours behind the UK and six behind Central Europe for most of the year. This is the friendliest US time zone for European callers: 2 pm in London is 9 am in Concord, and the working days overlap for several hours.

From India the state is nine and a half to ten and a half hours behind, so 7 pm in Delhi reaches New Hampshire mid-morning. Callers in Japan or Korea should ring in their own late evening to catch the New Hampshire morning of the same day.

Cross-border life blurs things at the southern edge. Many 603 residents commute to Boston and carry Massachusetts mobiles beginning 617, 781, or 978, while transplants keep 603 numbers after moving away, so the code marks where a number was issued, not where its owner sleeps.

Mobiles, Landlines, and What You Pay

Every 603 number, whether it rings a smartphone in Nashua or a fixed line in a Lakes Region cottage, is billed at the same international rate. The US numbering plan gives mobiles no separate range, so there is nothing to check before dialing.

For light, irregular calling a browser dialer is the low-commitment option. StartACall places calls over WebRTC in any modern browser, charges per minute with no subscription or connection fee, and keeps credit valid indefinitely between calls. Your first call costs nothing at all.

Frequently asked questions

Do Manchester and Portsmouth have different area codes?+

No. Every New Hampshire city and town uses 603. The state has never been split or overlaid, so one code covers the Seacoast, the Merrimack Valley, and the North Country alike.

How do I call New Hampshire from the UK?+

Dial 00, then 1, then 603 and the seven-digit local number. The UK is five hours ahead, so afternoon calls from Britain reach New Hampshire during morning business hours. Weekends work exactly the same way.

Could New Hampshire get a second code someday?+

Only if 603 nears exhaustion, in which case an overlay would be added over the whole state rather than splitting it. Nothing of the sort is in service today. Existing numbers would keep working unchanged.

Is a 603 mobile number more expensive to reach?+

No. US rates do not distinguish mobile from landline, so a 603 cell phone costs the same per minute as a 603 office number from any country. The device type never affects the price.

What time zone is New Hampshire in year round?+

Eastern Time, including daylight saving in summer. The whole state changes clocks together, so the offset from Europe stays five to six hours through most of the year. Noon in London is 7 am in Concord.

Last reviewed June 2026Reviewed by the StartACall calling teamDialing rules cross checked against ITU international dialing procedures
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