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About Dubuque County

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.

Description adapted from Wikipedia, CC BY-SA 4.0.

Dubuque County, Iowa
Dubuque IA - County Courthouse — CC BY 2.0, Dirk · source

History of Dubuque County

Dubuque County is named for French trader Julien Dubuque, the first European settler of Iowa, and an early lead mining pioneer in what is now Dubuque County. Dubuque was French Canadian and had (by most accounts) a friendly relationship with the local Meskwaki people. He and other early pioneers established a lucrative mining and trading industry in the area. When lead deposits began becoming exhausted, the pioneers developed boat building, lumber yards, milling, brewing, and machinery manufacturing to take its place. The city of Dubuque was chartered in 1833 as the first city in Iowa. The establishment of the City of Dubuque in 1833 led to large-scale settlement of the surrounding area. This was greatly encouraged by the Roman Catholic Church, which sent priests, bishops, and nuns to establish churches in the unpopulated countryside.

Adapted from Wikipedia, CC BY-SA 4.0.

Dubuque County at a glance

County seat
Dubuque
Population
99,266 (2020)
Land area
617 sq mi
Founded
1834

Largest communities in Dubuque County

  1. Dubuque county seat 59,667
  2. Dubuque Township 7,865
  3. Asbury 5,943
  4. New Wine Township 4,901
  5. Taylor Township 4,225

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Official channels

Dubuque County election resources

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Part of Iowa Voter Check

This is the Dubuque County page of Iowa Voter Check, a project of True the Vote, pointing Iowa voters at the official tools that already exist — and at Scan Check Protect to verify your registration.

Where anything here differs from what Dubuque County or the Iowa Secretary of State publishes, they are right and this page is not.