Black Hawk County Demographics

A map of Black Hawk County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	102,297	101,150	78.1%	77.1%
Black	11,985	13,529	9.1%	10.3%
Hispanic	6,861	6,448	5.2%	4.9%
Multiracial	5,074	5,161	3.9%	3.9%
Asian	3,516	3,412	2.7%	2.6%
Native American/Other	1,316	1,444	1.0%	1.1%

Black Hawk County, Iowa has an estimated population of 131,049, a less than 1% change from the 131,144 recorded in the 2020 Census. The population is 78.1% White, 9.1% Black, 5.2% Hispanic, 3.9% Multiracial, 2.7% Asian, and 1.0% Native American/Other. This demographic dot map shows the population of Black Hawk County, with one dot drawn for each person counted by the Census, color-coded by race.

Black Hawk has become less racially diverse since the 2020 Census. It is considerably more 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 Black Hawk County, that probability was 39.0% in 2020 and 37.7% in the most recent ACS estimates.

Black Hawk County is ranked the 5th most populous county in Iowa, out of 99 counties. Black Hawk County was ranked the 5th most populous county in the 2020 Census.

Black Hawk County's White Population

102,297 residents of Black Hawk County, or 78.1% of the population, identify as White. The share of White residents in Black Hawk County is slightly lower than in Iowa overall, where 82.3% of the population is White. Black Hawk County ranks 90th statewide in terms of White residents as a share of the population, out of 99 counties.

Since the 2020 Census, Black Hawk County's White population has grown by an estimated 1.1%. White residents' share of Black Hawk County's population has increased from 77.1% to 78.1%.

Black Hawk County is less White than neighboring Bremer County (92.3% White), Tama County (78.4% White), Benton County (94.4% White), Buchanan County (95% White), and Grundy County (94.9% White).

Black Hawk County's Black Population

11,985 residents of Black Hawk County, or 9.1% of the population, identify as Black. The share of Black residents in Black Hawk County is higher than in Iowa overall, where 3.8% of the population is Black. Black Hawk County ranks 1st statewide in terms of Black residents as a share of the population, out of 99 counties.

Since the 2020 Census, Black Hawk County's Black population has declined by an estimated 11.4%. Black residents' share of Black Hawk County's population has decreased from 10.3% to 9.1%.

Black Hawk County is more Black than neighboring Bremer County (1.1% Black), Tama County (0.9% Black), Benton County (0.4% Black), Buchanan County (0.6% Black), and Grundy County (0.6% Black).

Black Hawk County's Asian Population

3,516 residents of Black Hawk County, or 2.7% of the population, identify as Asian. The share of Asian residents in Black Hawk County is comparable to the share in Iowa overall, where 2.5% of the population is Asian. Black Hawk County ranks 10th statewide in terms of Asian residents as a share of the population, out of 99 counties.

Since the 2020 Census, Black Hawk County's Asian population has grown by an estimated 3.0%. Asian residents' share of Black Hawk County's population has remained roughly unchanged at 2.7%.

Black Hawk County is more Asian than neighboring Bremer County (0.9% Asian), Tama County (0.7% Asian), Benton County (0.2% Asian), Buchanan County (0.2% Asian), and Grundy County (0.5% Asian).

Black Hawk County's Hispanic Population

6,861 residents of Black Hawk County, or 5.2% of the population, identify as Hispanic. The share of Hispanic residents in Black Hawk County is slightly lower than in Iowa overall, where 7.3% of the population is Hispanic. Black Hawk County ranks 33rd statewide in terms of Hispanic residents as a share of the population, out of 99 counties.

Since the 2020 Census, Black Hawk County's Hispanic population has grown by an estimated 6.4%. Hispanic residents' share of Black Hawk County's population has remained roughly unchanged at 5.2%.

Black Hawk County is more Hispanic than neighboring Bremer County (2.1% Hispanic), Benton County (2% Hispanic), Buchanan County (1.9% Hispanic), and Grundy County (1.8% Hispanic). Black Hawk County is less Hispanic than neighboring Tama County (11.7% Hispanic).

Black Hawk County's Native American/Other Population

1,316 residents of Black Hawk 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 Black Hawk County is comparable to the share in Iowa overall, where 0.6% of the population is Native American/Other. Black Hawk County ranks 8th statewide in terms of Native American/Other residents as a share of the population, out of 99 counties.

Since the 2020 Census, Black Hawk County's Native American/Other population has declined by an estimated 8.9%. Native American/Other residents' share of Black Hawk County's population has remained roughly unchanged at 1.0%.

Black Hawk County is more Native American/Other than neighboring Benton County (0.2% Native American/Other), and Buchanan County (0.1% Native American/Other). Black Hawk County is less Native American/Other than neighboring Bremer County (1.1% Native American/Other), Tama County (5.4% Native American/Other), and Grundy County (1.2% Native American/Other).

Black Hawk County's Multiracial Population

5,074 residents of Black Hawk County, or 3.9% of the population, identify as Multiracial. The share of Multiracial residents in Black Hawk County is comparable to the share in Iowa overall, where 3.5% of the population is Multiracial. Black Hawk County ranks 9th statewide in terms of Multiracial residents as a share of the population, out of 99 counties.

Since the 2020 Census, Black Hawk County's Multiracial population has declined by an estimated 1.7%. Multiracial residents' share of Black Hawk County's population has remained roughly unchanged at 3.9%.

Black Hawk County is more Multiracial than neighboring Bremer County (2.6% Multiracial), Tama County (2.9% Multiracial), Benton County (2.8% Multiracial), Buchanan County (2.2% Multiracial), and Grundy County (1.1% 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.