Grundy County
Also known as Grundy County, Iowa, Grundy County, IA
county in Iowa, United States
Key facts
- Country
- United States
- State
- Iowa
- Founded
- January 15, 1851 (created), December 25, 1856 (organized)
- Named after
- Felix Grundy
- Seat
- Grundy Center
- Largest city
- Grundy Center
- Total
- 501.891 sq mi (1,299.89 km )
- Land
- 501.855 sq mi (1,299.80 km )
- Water
- 0.036 sq mi (0.093 km ) 0.01%
- Estimate 2025
- 12,361
- Density
- 24.567/sq mi (9.4853/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
~6 min read
Article
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 12,361 in 2025. 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.