603 area code: location, time zone and numbers
Since 1947, 603 has served as the telephone area code for Boston, New Hampshire in the US.
- Location
- The whole of New Hampshire
- Serving since
- 1947
- Local time zone
- Eastern time zone
- Overlay
- None: this is the only code for the area
- Calls within the area
- Full 10-digit dialling
- Rate centre list
- 148
- When numbers may run out
- 2040
- Country calling prefix
- +1 (United States)
Source: NANPA's public reports, the area code report and the rate-centre report, with a file date of 11/01/2026. For the exhaust year, we use NANPA's projections 2026-1 (April 2026). The official NANPA site is not this one.
Get your 603 number
There are two ways to get a 603 number. A provider hands out a new number with its plan. You choose it when you sign up, from the pool of numbers the provider holds in the code. For a one-time price, sellers list numbers they currently hold, often featuring a pattern. After buying one, you move the number to a provider.
Providers ranked by first-year cost
| Provider | Cheapest plan | First year | Link |
|---|---|---|---|
 Free app | Basic (Just for me), free | $0 | Open Google Voice |
 Free app | Free plan, free | $0 | Open TextNow |
 Developer API | Pay-as-you-go local number, $1.15 a month | $13.80 | Open Twilio |
 Second-number app | Standard, $3.99 a month billed yearly | $47.99 | Open Burner |
 Toll-free specialist | Solo, $6.99 a month billed yearly | $84 | Open UniTel Voice |
 Second-number app | Deluxe (local number), $6.99 a month billed yearly | $102.88 | Open GoDaddy Conversations (formerly Smartline) |
Sellers that list local numbers
| Seller | What it sells | Listed price | Monthly fee | Link |
|---|---|---|---|---|
 Marketplace | Local numbers | From $9 one-time | None stated | Search at Exclusive Digits |
 Marketplace | Local and toll-free | From $9.95 one-time | $2.99 a month | Search at NumberBarn |
 Number broker | Local and toll-free | From $99 one-time | None stated | Search at RingBoost |
 Number broker | Local and toll-free | From $100 one-time | None stated | Search at PhoneNumberExpert |
| 212areacode.comNumber broker | Local numbers | From $150 one-time | None stated | Search at 212areacode.com |
Some sellers and providers may pay us a referral fee. The ranking always follows first-year cost, without any change. How we make money
Places in the 603 area code
For 603, NANPA lists 148 rate centres. Every entry is a local calling area, and numbers are assigned to it:
Hanover, Hancock, Hampton, Hampstead, Groveton, Greenville, Greenfield, Gorham, Goffstown, Gilmanton Iron Works, Franklin, Franconia, Fitzwilliam, Farmington, Exeter, Errol, Epsom, Epping, Enfield, East Conway, Durham, Dunbarton, Dublin, Dover, Derry, Deerfield, Danbury, Center Sandwich, Center Ossipee, Center Barnstead, Conway, Contoocook, Concord, Colebrook, Claremont, Chichester, Chester, Chatham, Charlestown, Center Harbor, Canterbury, Candia, Canaan, Campton, Bristol, Bretton Woods, Bradford, Boscawen, Bethlehem, Berlin, Belmont, Bedford, Bartlett, Barrington, Barnstead, Ashland, Antrim, Andover, Alton, Alstead and 88 more.
603 area code questions
Which area does area code 603 cover?
In Boston, New Hampshire, 603 rings, as it does around Boston-Cambridge-Newton, MA-NH.
What country code applies to a 603 number?
+1. Because 603 sits in the North American Numbering Plan, from abroad you dial +1 603 plus the 7-digit number.
What time is it in the 603 area code?
603 stays on Eastern time.
Who calls using a 603 number?
This code includes numbers used by homes, mobiles, local businesses and callers who fake a local number. What a 603 number shows on your screen is where it was assigned, not who is calling.