Where is the 603 area code?

Area code 603 covers Manchester in New Hampshire, on Eastern Time.

What time zone is area code 603 in?

Numbers in the 603 area code sit in Eastern Time.

Is 603 a toll-free or scam area code?

No. 603 is a geographic North American Numbering Plan area code assigned to New Hampshire. Toll-free numbers use 800, 833, 844, 855, 866, 877 and 888. A call from 603 can still be spoofed, so treat unexpected calls with the usual caution.

Area code lookup

603 area code

Where the 603 area code is, which cities and counties it serves, the local time zone and the overlay codes dialled alongside it.

State: NH
Cities covered: 1
Counties: 1
Time zone: Eastern Time

Quick answer

Area code 603 serves Manchester in New Hampshire. It sits in Eastern Time and covers 1 county and about 5 ZIP codes across the metros we track. Numbers there are also dialled as 351, 978.

Cities in the 603 area code

Each city links to its full local profile: sales tax, housing, income and ZIP codes.

City	County	Time zone	ZIP codes
Manchester, NH	Hillsborough County	EST/EDT	5

Related area codes

Codes that share or border the same calling area.

603 area code FAQ

The questions people ask about this code.

Where is area code 603?

603 is a geographic area code in New Hampshire, covering Manchester.

What time is it in the 603 area code?

603 observes Eastern Time (EST/EDT).

Is 603 a scam area code?

No — it is a normal geographic code, not a toll-free or premium-rate prefix. Caller ID can be spoofed on any code, so verify unexpected callers before sharing information.

Sources & transparency

North American Numbering Plan Administrator (NANPA) area code assignments — area code to geography mapping and overlay relationships
US Census Bureau, American Community Survey 2019-2023 5-year estimates — city, county and ZIP code geography

Last reviewed August 2026. Figures are published for reference and can change; verify with the source agency before filing or contracting. How we build and check this data.