Castana
- County:
- Monona County
- County Seat:
- No
- Area (mi²):
- 0.907
- State:
- Iowa
Castana is a city located in Monona County, Iowa. Castana has a 2026 population of 103. Castana is currently declining at a rate of -0.96% annually and its population has decreased by -2.83% since the most recent census, which recorded a population of 106 in 2020.
The median household income in Castana is $55,469 with a poverty rate of 6.17%. The median age in Castana is 43.8 years: 43.9 years for males, and 38.9 years for females. For every 100 females there are 78.0 males.