What is an area code?

An area code is the three-digit prefix at the start of a North American phone number that identifies a specific geographic region — a city, metro area, or part of a state. In the number (212) 555-0100, the 212 is the area code for Manhattan in New York City.

How do I find the area code for a city?

Use the area code directory on this page: type a city, state, or three-digit code and the matching regions appear instantly. You can also browse the popular US area codes and the lookup-by-region sections below.

What is the difference between an area code and a country code?

A country code routes a call to a nation (for example +1 for the United States), while an area code routes it to a region within that nation. You dial the country code first when calling from abroad, then the area code, then the local number.

Can two cities share the same area code?

Yes. A single area code can cover several nearby cities or an entire metro region. As demand for numbers grows, regions are often split or given an additional overlay area code that serves the same geography.

What are toll-free area codes?

Toll-free numbers use special prefixes — 800, 833, 844, 855, 866, 877, and 888 — instead of a geographic area code. The business that owns the number pays for incoming calls, so they are free for the caller. They are popular for customer support and sales lines.

What state is area code 603 in?

Area code 603 is located in New Hampshire (NH), in the Northeast region of the United States. The capital of New Hampshire is Concord.

What time zone is area code 603 in?

Area code 603 operates in the Eastern Time (ET). If you are calling from a different time zone, make sure to account for the time difference before reaching out during business hours.

How can I get a 603 area code phone number for my business?

You can get a 603 local phone number through letsdial in minutes. Choose the 603 area code, select a local number, and route calls to your team from one cloud dashboard — no hardware required.

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Northeast

Area Code 603

Manchester, NH — New Hampshire

Area code 603 serves Manchester and New Hampshire. Get a local 603 number to build instant presence in this market.

Created in 1947 as one of the original North American area codes, 603 covers all of New Hampshire. Number pooling has pushed back the need for a statewide overlay.

Get a 603 number ← All area codes

+1 (603) XXX-XXXX

Manchester, NH

LIVE

Connecting…

ONHD Voice

18msLatency

99%Quality

End

State

New Hampshire (NH)

Capital: Concord

Time Zone

Eastern Time (ET)

Region

Northeast

US Census region

Code Type

Geographic

Original area code

Cities covered

Where does area code 603 cover?

Area code 603 serves communities across New Hampshire. Cities below represent the primary coverage area per the NANP.

Manchester
Nashua
Concord
Dover
Rochester
Portsmouth

About New Hampshire

New Hampshire phone number landscape

New Hampshire's single 603 area code covers a no-income-tax, no-sales-tax state making Manchester and Nashua magnets for businesses relocating from the high-cost Boston metro.

Number format

+1(603)XXX-XXXX

When dialing from outside the US, prefix with +1. Within the US, dial all 10 digits including the area code.

Get a 603 number for your business

History of Area Code 603

Created in 1947 as one of the original North American area codes, 603 covers all of New Hampshire. Number pooling has pushed back the need for a statewide overlay.

For your business

Why get a 603 area code number?

A local 603 number gives your business a genuine connection to the New Hampshire market — without the overhead of a physical location.

Local Market Access

Reach Manchester customers and businesses with a familiar local number. 603 numbers signal local presence to every caller.

Professional Credibility

A 603 number anchors your business in Manchester and New Hampshire, giving clients and partners a recognizable local point of contact that builds immediate professional trust.

Higher Answer Rates

Local area codes are far less likely to be blocked. A 603 number keeps your outreach out of the spam folder.

Flexible Operations

Start with one 603 number and add more as you grow — all managed from a single letsdial dashboard.

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How to obtain a 603 phone number.

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Local advantage

Benefits of a local New Hampshire number

A 603 area code tells New Hampshire customers you're local and easy to reach.

Local 603 numbers get answered more often than toll-free or out-of-state calls.
Build local trust and brand recognition without a physical office.
Keep your personal number private with a dedicated 603 business line.

Why local numbers win

+36%Higher answer rate vs. toll-free

+28%More callbacks from local numbers

4×Faster trust building with local code

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Area code 603 FAQs

Frequently asked about 603

Area code 603 covers Manchester, Nashua, Concord, Dover, Rochester, Portsmouth in New Hampshire. It is the primary area code for this region.

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