Area code 603 covers Manchester and surrounding areas in New Hampshire. It is one of the original 86 area codes established by AT&T in 1947. For the full picture, see all New Hampshire area codes.
| State | New Hampshire |
|---|---|
| Primary city | Manchester |
| Cities also served | Manchester, Nashua, Concord, Dover, Portsmouth, Rochester, Keene, Lebanon |
| Time zone | Eastern (UTC-5 / UTC-4 DST) |
| Year established | October 1947 |
| Original 1947 NPA? | Yes |
| Overlay codes | None |
| Currently in use? | Yes, actively assigned |
| Ten-digit dialing required? | Local seven-digit dialing may still apply |
Cities Served by Area Code 603
Area code 603 serves Entire state of New Hampshire, including the following cities and communities:
- Manchester
- Nashua
- Concord
- Dover
- Portsmouth
- Rochester
- Keene
- Lebanon
How to Get a 603 Phone Number
There are three ways to get a phone number with the 603 area code, each suited to a different need:
- Buy from a premium-number specialist. Companies that hold curated inventories of specific area codes can sell you a 603 number directly, often with a one-time fee and ownership transferred to you (no recurring carrier fees). This is the option for picking a specific memorable number, or for getting an area code that most carriers won’t let you request. Browse our 603 inventory.
- Sign up with a VoIP carrier. Voice-over-IP services (such as Google Voice, OpenPhone, Grasshopper, and many others) can typically provision a 603 number on request, especially for active overlay codes. You won’t usually get to pick the specific number, but you’ll get a working line in the area code. This is the cheapest option for anyone who doesn’t need a particular number.
- Port an existing 603 number. If you already have a 603 phone number with another carrier, you can transfer it (port it) to a new service provider while keeping the number. This works for landlines, cell phones, and VoIP services, though landlines outside of New Hampshire sometimes can’t accept inbound ports of 603 numbers due to 911 routing rules.
Looking for a 603 number? 212areacode.com offers premium 603 numbers for Manchester, New Hampshire — choose your number, port it to any carrier in 3–5 business days, and pay a one-time fee with no monthly charges. Browse available 603 numbers →
Ready to Get a 603 Number?
One-time fee. No monthly charges. Port to any carrier in 3–5 business days. NYC's most trusted source since 2009.
Browse 603 Numbers →Frequently Asked Questions
Is the 603 area code still in use?
Yes. 603 is actively assigned to new phone lines in Entire state of New Hampshire.
Can I get a 603 number if I don't live in New Hampshire?
Yes. Phone numbers are no longer tied to a physical address. With VoIP service or a number broker, you can hold a 603 number from anywhere in the world. The number routes to whatever device or carrier you specify.
Is 603 a scam area code?
No. 603 is a legitimate, active area code for Entire state of New Hampshire. Like any area code, scammers occasionally spoof 603 caller IDs, but the code itself is heavily used by real New Hampshire businesses, government offices, and residents.
What state is the 603 area code in?
Area code 603 covers the entire state of New Hampshire. It is the only area code in the state.
Has the 603 area code ever been split or overlaid?
No. Since its assignment in October 1947, area code 603 has never been split or received an overlay, making it one of a small number of original codes still serving the same undivided territory.
Do I need to dial ten digits for local calls within New Hampshire?
Yes. Ten-digit dialing (603 + seven-digit number) is required for all calls within the 603 area code, a requirement that took effect in advance of potential future number exhaustion.
Is the 603 area code at risk of running out of numbers?
Number conservation efforts by the New Hampshire Public Utilities Commission and state government have extended the projected exhaustion date. As of 2024, federal regulators projected depletion no earlier than 2029, with subsequent analyses pushing that estimate further out.
