Black Hawk County
Also known as Black Hawk County, Iowa, Black Hawk County, IA
county in Iowa, United States
Key facts
- Country
- United States
- State
- Iowa
- Named after
- Black Hawk
- Seat
- Waterloo
- Largest city
- Waterloo
- Total
- 573 sq mi (1,480 km )
- Land
- 566 sq mi (1,470 km )
- Water
- 6.9 sq mi (18 km ) 1.2%
- Estimate 2025
- 131,532
- Density
- 232/sq mi (89.5/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
- Congressional district
- 2nd
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Article
Black Hawk County is a county in the northeastern part of the U.S. state of Iowa. As of the 2020 census, the population was 131,144, making it Iowa's fifth-most populous county. The county seat is Waterloo.
Black Hawk County is part of the Waterloo – Cedar Falls metropolitan area.