County Maps US

Dubuque County, Iowa

A county in Iowa, ranked 9 of 99 by population.

CountyFIPS 19061

Within Iowa
Dubuque County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Dubuque, the county seat, located via the 2025 Census Gazetteer.

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Population
99,381
+70 (+0.1%) since 2020
Land area
608.3
square miles. A further 1.3% of the total area is water
Population density
163
people per square mile, computed rather than published
County seat
Dubuque
Seat of county government.
Established
1834
191 years ago
Largest city
Dubuque city
Population 59,148.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Dubuque County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Dubuque County, Iowa from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 644 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Dubuque County ranks

Position among the 99 counties of Iowa, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn IowaNationally
Population99,3819th of 99625th of 3,144
Land area608.3 sq mi21st of 991,596th of 3,144
Population density163 per sq mi8th of 99658th of 3,144
Median household income$77,63021st of 99691st of 3,143

Full data for Dubuque County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population99,381Vintage 2025 Population Estimates
Population in 202099,311Vintage 2025 Population Estimates
2020 estimates base?99,280Vintage 2025 Population Estimates
Land area608.3 sq mi2025 Gazetteer Files
Water area8.2 sq mi2025 Gazetteer Files
Total area616.5 sq mi2025 Gazetteer Files
Population density?163 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$77,630American Community Survey 2020-2024 5-Year Estimates
Median home value$237,300American Community Survey 2020-2024 5-Year Estimates
Median age39.1American Community Survey 2020-2024 5-Year Estimates
Households40,989American Community Survey 2020-2024 5-Year Estimates
Housing units43,288American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
+79
1,132 births, 1,053 deaths
Net migration
+262
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering Dubuque County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Jackson CountyIowa28 mi19,288
Delaware CountyIowa24 mi17,674
Grant CountyWisconsin20 mi52,446
Jo Daviess CountyIllinois14 mi21,594
Clayton CountyIowa14 mi16,845
Jones CountyIowa12 mi21,253

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 99 counties of Iowa

Open the interactive Iowa county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.