Grundy County, Iowa

Grundy County, Iowa
The Grundy County Courthouse in Grundy Center
Location within the U.S. state of Iowa
Coordinates: 42°24′12″N 92°47′25″W / 42.403339°N 92.790244°W / 42.403339; -92.790244
Country United States
State Iowa
FoundedJanuary 15, 1851 (created)
December 25, 1856 (organized)
Named afterFelix Grundy
SeatGrundy Center
Largest cityGrundy Center
Area
 • Total
501.891 sq mi (1,299.89 km2)
 • Land501.855 sq mi (1,299.80 km2)
 • Water0.036 sq mi (0.093 km2)  0.01%
Population
 (2020)
 • Total
12,329
 • Estimate 
(2024)
12,405
 • Density24.567/sq mi (9.4853/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Area code319
Congressional district2nd
Websitegrundycountyiowa.gov
  • Iowa county number 38

Grundy County is a county located in the U.S. state of Iowa. At the 2020 census, the population was 12,329, and was estimated to be 12,405 in 2024. The county seat and the largest city is Grundy Center. The county is named for Felix Grundy, former U.S. Attorney General.

Grundy County is included in the Waterloo–Cedar Falls metropolitan area.