Mahaska County, Iowa

Mahaska County
The courthouse in Oskaloosa, built 1886, is on the NRHP. The architect was Henry C. Koch.
Location within the U.S. state of Iowa
Iowa's location within the U.S.
Coordinates: 41°20′02″N 92°38′44″W / 41.333888888889°N 92.645555555556°W / 41.333888888889; -92.645555555556
Country United States
State Iowa
FoundedFebruary 17, 1843
Named afterChief Mahaska
SeatOskaloosa
Largest cityOskaloosa
Area
  Total
573 sq mi (1,480 km2)
  Land571 sq mi (1,480 km2)
  Water2.5 sq mi (6 km2)  0.4%
Population
 (2020)
  Total
22,190
  Density39/sq mi (15/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district2nd
Websitewww.mahaskacountyia.gov

Mahaska County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 22,190. The county seat is Oskaloosa.

Mahaska County comprises the Oskaloosa, IA Micropolitan Statistical Area.