Monona County, Iowa

Monona County, Iowa
Location within the U.S. state of Iowa
Coordinates: 42°02′50″N 95°58′07″W / 42.047222222222°N 95.968611111111°W / 42.047222222222; -95.968611111111
Country United States
State Iowa
Founded1851
SeatOnawa
Largest cityOnawa
Area
 • Total
699 sq mi (1,810 km2)
 • Land694 sq mi (1,800 km2)
 • Water4.9 sq mi (13 km2)  0.7%
Population
 (2020)
 • Total
8,751
 • Estimate 
(2024)
8,429
 • Density12.6/sq mi (4.87/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional district4th
Websitewww.mononacounty.org
  • Iowa county number 67

Monona County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 8,751. The county seat is Onawa.