Dubuque County, Iowa

Dubuque County
Location within the U.S. state of Iowa
Iowa's location within the U.S.
Coordinates: 42°28′15″N 90°52′42″W / 42.47083°N 90.87833°W / 42.47083; -90.87833
Country United States
State Iowa
Founded1834
Named afterJulien Dubuque
SeatDubuque
Largest cityDubuque
Area
  Total
617 sq mi (1,600 km2)
  Land608 sq mi (1,570 km2)
  Water8.3 sq mi (21 km2)  1.4%
Population
 (2020)
  Total
99,266
  Density160/sq mi (62/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district2nd
Websitewww.dubuquecountyiowa.gov

Dubuque County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 99,266, making it the eighth-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, IA Metropolitan Statistical Area.