Altha
- County:
- Calhoun County
- County Seat:
- No
- Area (mi²):
- 1.337
- State:
- Florida
Altha is a town located in Calhoun County, Florida. Altha has a 2026 population of 495. Altha is currently declining at a rate of -0.2% annually but its population has increased by 0.81% since the most recent census, which recorded a population of 491 in 2020.