
Sibley
- County:
- Osceola County
- County Seat:
- Yes
- Area (mi²):
- 1.786
- State:
- Iowa
Sibley is a city located in Osceola County, Iowa. Sibley has a 2025 population of 2,697. It is also the county seat of .Sibley is currently declining at a rate of -1.17% annually and its population has decreased by -5.6% since the most recent census, which recorded a population of 2,857 in 2020.
The average household income in Sibley is $73,547 with a poverty rate of 23.72%. The median age in Sibley is 39 years: 33.1 years for males, and 48.3 years for females.