
Letha
- County:
- Gem County
- County Seat:
- No
- Area (mi²):
- 0.452
- State:
- Idaho
Letha is a CDP located in Gem County, Idaho. Letha has a 2025 population of 715. Letha is currently growing at a rate of 7.2% annually and its population has increased by 26.55% since the most recent census, which recorded a population of 565 in 2020.
The average household income in Letha is $126,277 with a poverty rate of 1.41%. The median age in Letha is 51.3 years: 23.5 years for males, and 54.9 years for females.