Osceola County, Iowa

Osceola County, Iowa
The Osceola County Courthouse in Sibley in July 2014
Location within the U.S. state of Iowa
Coordinates: 43°22′43″N 95°38′02″W / 43.378542°N 95.633788°W / 43.378542; -95.633788
Country United States
State Iowa
FoundedJanuary 15, 1851 (created)
January 1, 1872 (organized)
Named afterOsceola
SeatSibley
Largest citySibley
Area
 • Total
399.396 sq mi (1,034.43 km2)
 • Land398.687 sq mi (1,032.59 km2)
 • Water0.709 sq mi (1.84 km2)  0.18%
Population
 (2020)
 • Total
6,192
 • Estimate 
(2024)
6,036
 • Density15.53/sq mi (5.997/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Area code712
Congressional district4th
Websiteosceolacountyia.gov
  • Iowa county number 72

Osceola County (/ˌɒsiˈlə/ OSS-ee-OH-lə) is a county located in the U.S. state of Iowa. As of the 2020 census the population was 6,192, and was estimated to be 6,036 in 2024, making it the fifth-least populous county in Iowa. It is named for Seminole war chief Osceola. The county seat and the largest city is Sibley, named for H. H. Sibley of Minnesota.