State directory / New Hampshire
US number directory / New Hampshire
New Hampshire
area codes
The earliest listed New Hampshire code is 603, in service since 1947; the state now has 1 geographic code.
1geographic area code
in this reference
in this reference
Earliest listed603 · 1947
Standard timeET
Overlays in this stateNone recorded in this snapshot
Major city starting points
Concord (capital): 603; Manchester (largest city in state reference): 603.
| City | Reference role | Codes to check |
|---|---|---|
| Concord | Capital | 603 |
| Manchester | Largest city in state reference | 603 |
City reference · 2026-10-25
Codes, cities & coverage
NANPA lists no active overlay complex for New Hampshire on 2026-10-25.
| Code | Region / major cities named in the reference | Introduced | Active overlay complexes |
|---|---|---|---|
| 603 | New Hampshire (all) | 01-Jan-1947 | None active in NANPA snapshot |
NANPA dates & overlays · 2026-10-25
Wikipedia geography · 2026-10-25 · CC BY-SA 4.0
Time zones
New Hampshire spans 1 standard-time offset in the state reference: ET.
| Standard offset | Region | Daylight saving |
|---|---|---|
| UTC−05:00 ET | Eastern | Yes |