
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 2025 population of 101. Castana is currently declining at a rate of -0.98% annually and its population has decreased by -3.81% since the most recent census, which recorded a population of 105 in 2020.
The average household income in Castana is $66,186 with a poverty rate of 7.64%. The median age in Castana is 59.7 years: 61.1 years for males, and 58.5 years for females.