Area code 603 — Manchester, New Hampshire

Where is area code 603?

Area code 603 is in Manchester, New Hampshire, covering Manchester and surrounding communities in New Hampshire. All 603 numbers are on Eastern Time.

Is area code 603 a scam?

No. Area code 603 is a legitimate area code serving Manchester since 1947. Scammers spoof caller ID to display 603 numbers, which is why complaints exist against a code that is itself genuine.

Neighbour spoofing is the reason a local-looking number is not a guarantee. A caller anywhere in the world can display a 603 number, and the number they display may belong to a real business in Manchester that has nothing to do with the call.

• ·Area code 603 had 259 different numbers reported for spam calls in the 30 days to 28 July 2026.
• ·Area code 603 ranks 239th of 331 US geographic area codes by spam complaint volume.
• ·Of the 278 complaints about area code 603 in the 30 days to 28 July 2026, 53% were reported as a recorded message or robocall.
• ·The most reported subject on area code 603 is calls pretending to be government, businesses, or family and friends, appearing in 18% of its complaints in the 30 days to 28 July 2026.

What these calls were about

Each figure is that subject’s share of every 603 complaint in the 30 days to 28 July 2026, as categorised by the consumer who reported it.

Businesses can prevent their own numbers from being mistaken for calls like these.

Why am I getting text messages from area code 603?

Texts from 603 numbers follow the same pattern as calls — mostly local businesses and services. Treat any text asking for payment or credentials as suspect regardless of the code.

The common patterns are a wrong-number opener that turns into conversation, an unsolicited job offer, and a crypto or investment tip. Do not reply, do not follow the link, and forward the message to 7726 (SPAM) to report it to your carrier.

Who works in the Manchester area?

Area code 603 covers all of New Hampshire, a rare single-code state, and Manchester is its largest city and commercial anchor. The old Amoskeag mill buildings along the Merrimack River now house software firms, biotech labs, and the Millyard campus of the ARMI biofabrication institute, while healthcare systems like Elliot Hospital and Catholic Medical Center rank among the city's largest employers. Manchester's median household income reached $81,007 in 2024, growing 4.64% year over year, with an employed population of about 68,000, per DataUSA. The state's lack of a general income tax or sales tax shapes how firms price, hire, and recruit across the border from Massachusetts.

Who lives in the 603 region

Manchester's 2024 population was 115,643 with a median age of 38. The city is less diverse than national averages, with White non-Hispanic residents making up the large majority, though it has been a refugee resettlement hub for decades and 13.5% of residents were born abroad. Canada, India, and the Dominican Republic are the most common origins for foreign-born residents statewide. Homeownership sits at 48.7%, low for New Hampshire, reflecting a renter-heavy urban core, and the median property value of $365,600 climbed 8.71% in a single year as Boston-area buyers pushed north.

What a 603 number signals to a caller

Doing business in the 603 tends toward the direct and unpretentious. Callers describe New Hampshire contacts as brisk but courteous, with a strong preference for getting to the point, and a local 603 number carries weight in a state where the code doubles as regional identity on bumper stickers and craft beer labels. Ten-digit dialing is now standard even within the single code. Firms selling into Manchester generally find that answering calls with knowledge of the state's tax structure is expected, since it is often the reason the prospect is there.

Questions