State directory / Idaho
US number directory / Idaho
Idaho
area codes
Idaho has 2 geographic area codes in the NANPA snapshot, with 208 the earliest listed (1947).
2geographic area codes
in this reference
in this reference
Earliest listed208 · 1947
Standard timeMT / PT
Overlays in this stateYes — see code notes
Major city starting points
Boise (capital and largest city): 208, 986.
| City | Reference role | Codes to check |
|---|---|---|
| Boise | Capital and largest city | 208, 986 |
City reference · 2026-10-25
Codes, cities & coverage
Idaho's active territorial overlay complexes are 208/986.
| Code | Region / major cities named in the reference | Introduced | Active overlay complexes |
|---|---|---|---|
| 208 | Idaho (all) | 01-Jan-1947 | 208/986 |
| 986 | Idaho | 05-Sep-2017 | 208/986 |
NANPA dates & overlays · 2026-10-25
Wikipedia geography · 2026-10-25 · CC BY-SA 4.0
Time zones
Idaho spans 2 standard-time offsets in the state reference: MT / PT.
| Standard offset | Region | Daylight saving |
|---|---|---|
| UTC−07:00 MT | Most of state: UTC−07:00 MST Mountain Standard Time (A legislative error in 1923 in the Calder Act seemingly put this area at UTC−06:00 CST, and was corrected by Congress in 2007. ) 15 U.S.C. ch. 6 , § 264. MST has been observed since 1923. | Yes |
| UTC−08:00 PT | North of the Salmon River, that is between the Oregon state border and the Idaho County/Lemhi County border; west of the Idaho County/Lemhi County border, that is between the Salmon River and the Montana state border: UTC−08:00 PST Pacific Standard Time | Yes |