
Calumet
- County:
- O'Brien County
- County Seat:
- No
- Area (mi²):
- 0.266
- State:
- Iowa
Calumet is a city located in O'Brien County, Iowa. Calumet has a 2025 population of 138. Calumet is currently declining at a rate of -0.72% annually and its population has decreased by -4.83% since the most recent census, which recorded a population of 145 in 2020.
The average household income in Calumet is $96,635 with a poverty rate of 25.19%. The median age in Calumet is 32.8 years: 26.5 years for males, and 39 years for females.