Dubuque County Demographics

A map of Dubuque County's Population by Race

Dubuque County, Iowa has an estimated population of 99,030, a less than 1% change from the 99,266 recorded in the 2020 Census. The population is 88.3% White, 3.3% Hispanic, 3.3% Multiracial, 2.9% Black, 1.3% Asian, and 1.0% Native American/Other. This demographic dot map shows the population of Dubuque County, with one dot drawn for each person counted by the Census, color-coded by race.

Dubuque is about as racially diverse as it was in the 2020 Census. It is considerably less diverse than Iowa overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Dubuque County, that probability was 22.2% in 2020 and 21.8% in the most recent ACS estimates.

Dubuque County is ranked the 9th most populous county in Iowa, out of 99 counties. Dubuque County was ranked the 8th most populous county in the 2020 Census.

Dubuque County's White Population

87,398 residents of Dubuque County, or 88.3% of the population, identify as White. The share of White residents in Dubuque County is higher than in Iowa overall, where 82.3% of the population is White. Dubuque County ranks 71st statewide in terms of White residents as a share of the population, out of 99 counties.

Since the 2020 Census, Dubuque County's White population has remained roughly the same. White residents' share of Dubuque County's population has remained roughly unchanged at 88.3%.

Dubuque County is less White than neighboring Jones County (91.5% White), Jackson County (93.6% White), Grant County (93% White), Delaware County (94.1% White), and Clayton County (95% White).

Dubuque County's Black Population

2,890 residents of Dubuque County, or 2.9% of the population, identify as Black. The share of Black residents in Dubuque County is comparable to the share in Iowa overall, where 3.8% of the population is Black. Dubuque County ranks 10th statewide in terms of Black residents as a share of the population, out of 99 counties.

Since the 2020 Census, Dubuque County's Black population has declined by an estimated 28.4%. Black residents' share of Dubuque County's population has decreased from 4.1% to 2.9%.

Dubuque County is more Black than neighboring Jones County (2.5% Black), Jackson County (1% Black), Grant County (1.5% Black), Delaware County (0.1% Black), and Clayton County (0.6% Black).

Dubuque County's Asian Population

1,326 residents of Dubuque County, or 1.3% of the population, identify as Asian. The share of Asian residents in Dubuque County is comparable to the share in Iowa overall, where 2.5% of the population is Asian. Dubuque County ranks 22nd statewide in terms of Asian residents as a share of the population, out of 99 counties.

Since the 2020 Census, Dubuque County's Asian population has grown by an estimated 30.3%. Asian residents' share of Dubuque County's population has remained roughly unchanged at 1.3%.

Dubuque County is more Asian than neighboring Jones County (0.6% Asian), Jackson County (0.1% Asian), Grant County (0.7% Asian), Delaware County (0% Asian), and Clayton County (0.3% Asian).

Dubuque County's Hispanic Population

3,234 residents of Dubuque County, or 3.3% of the population, identify as Hispanic. The share of Hispanic residents in Dubuque County is slightly lower than in Iowa overall, where 7.3% of the population is Hispanic. Dubuque County ranks 56th statewide in terms of Hispanic residents as a share of the population, out of 99 counties.

Since the 2020 Census, Dubuque County's Hispanic population has grown by an estimated 8.6%. Hispanic residents' share of Dubuque County's population has remained roughly unchanged at 3.3%.

Dubuque County is more Hispanic than neighboring Jones County (2.6% Hispanic), Jackson County (1.6% Hispanic), Grant County (2.6% Hispanic), Delaware County (1.7% Hispanic), and Clayton County (2.3% Hispanic).

Dubuque County's Native American/Other Population

956 residents of Dubuque County, or 1.0% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Dubuque County is comparable to the share in Iowa overall, where 0.6% of the population is Native American/Other. Dubuque County ranks 7th statewide in terms of Native American/Other residents as a share of the population, out of 99 counties.

Since the 2020 Census, Dubuque County's Native American/Other population has declined by an estimated 20.3%. Native American/Other residents' share of Dubuque County's population has remained roughly unchanged at 1.0%.

Dubuque County is more Native American/Other than neighboring Jones County (0.1% Native American/Other), Grant County (0.4% Native American/Other), Delaware County (0.5% Native American/Other), and Clayton County (0.1% Native American/Other). Dubuque County is less Native American/Other than neighboring Jackson County (1.1% Native American/Other).

Dubuque County's Multiracial Population

3,226 residents of Dubuque County, or 3.3% of the population, identify as Multiracial. The share of Multiracial residents in Dubuque County is comparable to the share in Iowa overall, where 3.5% of the population is Multiracial. Dubuque County ranks 36th statewide in terms of Multiracial residents as a share of the population, out of 99 counties.

Since the 2020 Census, Dubuque County's Multiracial population has grown by an estimated 20.0%. Multiracial residents' share of Dubuque County's population has increased from 2.7% to 3.3%.

Dubuque County is more Multiracial than neighboring Jones County (2.7% Multiracial), Jackson County (2.6% Multiracial), Grant County (1.9% Multiracial), and Clayton County (1.7% Multiracial). Dubuque County is less Multiracial than neighboring Delaware County (3.7% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.