Discovering the truth about a phone number, email, or address history can be eye-opening, please use this tool with caution.USA Area code 603 - All of New Hampshire
Area code 603 is a statewide North American Numbering Plan code serving all of New Hampshire; its largest city is Concord. It was activated in 1947 and today serves all of New Hampshire, home to roughly 1.4 million residents (US Census Bureau estimate, July 2025) .
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Who called me from area code 603?
A call from area code 603 can come from anywhere in New Hampshire - it is a statewide code, with Concord its largest city - but caller ID spoofing means the area code alone cannot confirm who called. Right now, 25 603 numbers carry scam reports on this page. The only reliable way to identify the caller is to check the full 10-digit number:
- Run the number through the reverse phone lookup at the top of this page to see the owner's name, carrier, and location.
- Compare it against the recently reported scam numbers in 603 below.
- If the call was unwanted, report it to the FTC and use the report form on this page so other 603 residents see it.
Report a scam call from 603 Help other 603-area residents - takes 20 seconds, no signup
Reports are reviewed by our team before appearing on the page. The highest-reported numbers get added to the “Recently reported scam numbers” list above with a “community” badge.
Should I answer a call from a 603 number? Take the 30-second quiz - 5 questions, verdict + advice
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Next step: run a reverse-phone lookup on the number to see everything public about it.
Where is the 603 area code? Coverage map
The pin marks Concord, the largest city in New Hampshire. Zoom and pan to explore the coverage region.
Interactive map. Click a pin for city details. Data © OpenStreetMap contributors.
Area codes near 603 (overlay + neighboring)
If a caller ID shows one of these codes, the call is probably still from the Concord area or a nearby region. Click any code to see its own page.
603 area code robocall complaints (FCC data)
Monthly count of FCC complaints tagged to numbers in area code 603 over the last 12 months.
82 complaints in the last 12 months. That's about 61% fewer robocall complaints per capita than the US average - 6 per 100,000 residents vs a national average of 14.7.
Source: FCC Consumer Complaint Data (dataset vakf-fz8e). Data as of August 9, 2026. Refreshed monthly.
How 603 area code spam calls arrive
Based on 82 FCC complaints in the last 12 months, here's how 603 spam calls reached recipients:
FCC Consumer Complaint Data, last 12 months as of August 9, 2026. Refreshed monthly. Note: the FCC dataset labels method (Live Voice / Prerecorded / SMS) but does not classify scam type (IRS impersonation, tech support fraud, etc.) - those come from community reports.
Recently reported scam numbers in 603
Numbers reported to the FCC or by our community in the last 12 months. Click any to run a full reverse-phone lookup.
Source: FCC Consumer Complaint Data, last 12 months as of August 9, 2026. Refreshed monthly. Numbers submitted via the report form near the top of this page get added here with a “community” badge after moderation.
How to block 603 spam calls (by carrier)
Getting repeated spam calls from 603 numbers around Concord, New Hampshire? You can't legitimately block every 603 call without also missing legitimate ones from Concord, New Hampshire - so the practical fix is to turn on your carrier's free spam filter and register on the national do-not-call list. Step-by-step for each major US carrier below.
AT&T
- Download the free AT&T ActiveArmor app (iOS + Android).
- Sign in with your wireless number.
- Enable Fraud Blocking and Suspected Spam Warning.
- To block a specific number, tap the call in your history → Block.
Verizon
- Download the free Verizon Call Filter app (iOS + Android).
- Sign in with your Verizon account.
- Turn on Spam Filter.
- To block a specific number: My Verizon → Blocks → Add Number.
T-Mobile
- Download the free Scam Shield app (iOS + Android).
- Enable Scam Block (blocks known scam calls silently).
- Use Scam ID to see “Scam Likely” caller ID on suspicious numbers.
- To block a specific number, dial
#662#from your device.
All carriers
- Register on the FTC's National Do-Not-Call list.
- Report unwanted calls to the FCC at fcc.gov/complaints.
- On iPhone: Settings → Phone → Silence Unknown Callers.
- On Android: Phone app → ⋮ → Settings → Caller ID & spam.
Sources: carrier support pages (AT&T, Verizon, T-Mobile), FCC consumer guides. Free features as of 2026. Every one of these steps costs nothing.
History of the 603 area code
state of New Hampshire. It was assigned as one of the 86 original North American area codes in October 1947. In 2011, area code 603 was projected to near exhaustion and a second area code for New Hampshire was expected to be activated by 2013 in a statewide overlay complex.
603 area code FAQ: common questions
What area code is 603?
Area code 603 is a North American Numbering Plan area code that serves Telephone area code for all of New Hampshire in New Hampshire, primarily including Concord and surrounding communities. It was activated in 1947.
Where does area code 603 cover?
Area code 603 covers the Concord, New Hampshire area.
Is 603 a real area code or a scam?
603 is a real, actively-assigned US area code - not itself a scam. However, spammers do use 603 numbers because the code is well-known and appears local to millions of residents. Always verify the specific number, not the area code.
How do I block 603 spam calls?
You cannot legitimately block an entire area code without also blocking legitimate calls from Concord. Better options: register on the National Do-Not-Call list, enable your carrier's spam-filter (all major US carriers now offer this free), and report unwanted calls to the FCC at fcc.gov/complaints so they show up in the trend data on this page.
What's the overlay area code for 603?
603 does not currently have an overlay area code assigned. New numbers in the region are still issued with the 603 prefix.
Sources
Or explore reverse-phone lookup for any US number.