| Official Name: | Fenn, Idaho |
| Pushpin Map: | Idaho#USA |
| Pushpin Label: | Fenn |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Idaho |
| Subdivision Type2: | County |
| Subdivision Name2: | Idaho |
| Timezone: | Pacific (PST) |
| Utc Offset: | -8 |
| Timezone Dst: | PDT |
| Utc Offset Dst: | -7 |
| Elevation Ft: | 3274 |
| Coordinates: | 45.965°N -116.26°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 83531 |
| Area Code: | 208, 986 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 396482[1] |
Originally Tharp, it was named in 1915 (or earlier)[2] after the Fenn family.[3] Stephen S. Fenn (1820 - 92)[4] arrived in Florence from California in 1862 with his wife and four children.[5] He was an early settler, attorney, administrator, speaker of territorial legislature, and a territorial delegate to Congress. His son, Major Frank A. Fenn also of many professions, was the speaker of the first state legislature. Frank's son Lloyd (1884 - 1953) also served in the
An earlier settlement a few miles north, Denver, was mostly abandoned after the Camas Prairie Railroad bypassed it. A grain elevator was constructed in Fenn in 1918,[6] and an upgrade was added in 1946,[7] served by the railroad until the abandonment of its Second Subdivision line to Grangeville in late 2000.[8] [9]
Fenn's population was 25 in 1960.[10]
According to the Köppen Climate Classification system, Fenn has an oceanic climate, abbreviated "Cfb" on climate maps. The hottest temperature recorded in Fenn was 110F on June 19, 2021, while the coldest temperature recorded was -16F on January 10, 1949.