New Hampshire area codes
One area code — 603 — covers all of New Hampshire. The state's numbering history begins in 1947 with 603. Most recent addition: 603, in service since 1947.
Coverage runs through 603 (Manchester); prefix counts in the table approximate each code's numbering footprint.
Every New Hampshire code keeps Eastern time.
Every New Hampshire community — Manchester, Nashua, Concord, Derry among the largest — shares the single 603 code, a simplicity most states lost to overlays years ago.
603, in service since 1947, anchors Manchester, carries 752 active prefixes across 147 rate centers, split among 49 carriers. 601 of its prefixes are pooled — shared between carriers in thousands-number blocks. It is the only area code serving New Hampshire. NANPA projects its capacity to last until 4Q 2040 — no relief needed for decades. Local dialing is ten digits.
Toll-free callers are a separate story: 800-family numbers carry no New Hampshire geography at all, so an 833 or 877 number is never "from" the state — it belongs to whichever business rents it, anywhere in the NANP.
A number in any of these codes was issued in New Hampshire, but portability means its owner may be anywhere today — the codes locate numbers, not people. To dig further, open a code's prefix or cities pages.
| Code | Major area | In service | Overlay complex | Prefixes |
|---|---|---|---|---|
| 603 | Manchester | 1947 | — | 752 |
FAQ
How many area codes does New Hampshire have?
1 geographic area code is currently in service: 603.
Will New Hampshire get a new area code soon?
Not soon. The earliest exhaust forecast in the state is 603 at 4Q 2040, so current codes have ample capacity.
Which time zone are New Hampshire numbers in?
All New Hampshire area codes are in the Eastern time zone.