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Dubuque County
Also known as Dubuque County, Iowa, Dubuque County, IA
county in Iowa, United States
Key facts
- Country
- United States
- State
- Iowa
- Founded
- October 1, 1834
- Named after
- Julien Dubuque
- Seat
- Dubuque
- Largest city
- Dubuque
- Total
- 616.461 sq mi (1,596.63 km )
- Land
- 608.299 sq mi (1,575.49 km )
- Water
- 8.162 sq mi (21.14 km ) 1.32%
- Estimate 2025
- 99,381
- Density
- 163.19/sq mi (63.007/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
~14 min read
Article
Dubuque County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 99,266, and was estimated to be 99,381 in 2025, making it the ninth-most populous county in Iowa. The county seat is Dubuque. The county is named for Julien Dubuque, the first European settler of Iowa. Dubuque County comprises the Dubuque, Iowa Metropolitan statistical area.
History