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US area code · New Hampshire

603 area code

Where the 603 area code is, its overlay and how to dial a +1 603 number from anywhere.

CoversEast Concord, New HampshireTime zoneEastern (ET)TypeGeographic
Quick answer

The 603 area code is in East Concord, New Hampshire, United States (Eastern (ET)). To call from abroad: +1 603 555-0123.

StateNew Hampshire
Main areaEast Concord
Time zoneEastern (ET)
TypeGeographic
10-digit dialingRequired
In service since01-Jan-1947

The 603 area code is a geographic North American Numbering Plan (NANP) code covering East Concord, New Hampshire. It has been in service since 01-Jan-1947 and sits in the Eastern (ET) time zone.

How to dial a 603 number

From abroad+1 603 555-0123
Within the US / Canada1 603 555-0123
Locally (same area)603 555-0123

Cities in the 603 area code

A 603 number is usually in one of these places in New Hampshire — 4 counties.

Derry RockinghamDover StraffordEast ConcordKeene CheshireManchester HillsboroughNashua HillsboroughPortsmouth RockinghamRochester Strafford

Frequently asked questions

Where is the 603 area code?

The 603 area code is in East Concord, New Hampshire, United States (Eastern (ET)).

Do I have to dial 10 digits for 603?

Yes — dial the area code plus the seven-digit number.

How do I call a 603 number from another country?

Dial your exit code (or +), then 1, then 603, then the number: +1 603 555-0123.

Source: NANPA numbering plan. An area code covers a region, not a precise address — a 603 number does not pinpoint a street or ZIP code.

Number holders in area code 603

Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 768 prefixes are in use in 603, shared by 53 companies. The largest holders:

CompanyPrefixesShare
Consolidated Comm Of No. New England-Nh24732%
Bell Atlantic Mobile, Inc7410%
Paetec Itel, LLC588%
Mcimetro Access Transmission Services LLC446%
Comcast Ip Phone, LLC405%
Omnipoint Miami E License, LLC385%

Source: NANPA central office code assignments. A number keeps its original prefix when it is ported to another carrier.

Complaints about 603 numbers

Reports to the FTC, last 30 days
399
Recorded messages or robocalls
57%
Rank among area codes
#244 of 670
Most reported subjects
Other (174)
Dropped call or no message (52)
Calls pretending to be government, businesses, or family and friends (43)

Period Aug 26 – Sep 24, 2026. These are the numbers shown on the caller ID of the reported calls; many are spoofed and do not belong to the real caller.

Source: US Federal Trade Commission, Do Not Call reported calls data (daily files).

All US area codes United States +1 Map of area code 603 — cities & rate centres

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