Rock County Demographics

A map of Rock County's Population by Race

Rock County, Minnesota has an estimated population of 9,621, a less than 1% change from the 9,704 recorded in the 2020 Census. The population is 91.4% White, 4.0% Hispanic, 3.5% Multiracial, 0.6% Native American/Other, 0.4% Asian, and 0.1% Black. This demographic dot map shows the population of Rock County, with one dot drawn for each person counted by the Census, color-coded by race.

Rock is about as racially diverse as it was in the 2020 Census. It is considerably less diverse than Minnesota overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Rock County, that probability was 15.9% in 2020 and 16.2% in the most recent ACS estimates.

Rock County is ranked the 70th most populous county in Minnesota, out of 87 counties. Rock County was ranked the 69th most populous county in the 2020 Census.

Rock County's White Population

8,791 residents of Rock County, or 91.4% of the population, identify as White. The share of White residents in Rock County is significantly higher than in Minnesota overall, where 75.9% of the population is White. Rock County ranks 22nd statewide in terms of White residents as a share of the population, out of 87 counties.

Since the 2020 Census, Rock County's White population has declined by an estimated 1.1%. White residents' share of Rock County's population has remained roughly unchanged at 91.4%.

Rock County is more White than neighboring Pipestone County (84.1% White), Nobles County (52.2% White), Minnehaha County (78.6% White), and Moody County (73.9% White). Rock County is less White than neighboring Lyon County (93.4% White).

Rock County's Black Population

14 residents of Rock County, or 0.1% of the population, identify as Black. The share of Black residents in Rock County is lower than in Minnesota overall, where 6.9% of the population is Black. Rock County ranks 55th statewide in terms of Black residents as a share of the population, out of 87 counties.

Since the 2020 Census, Rock County's Black population has declined by an estimated 72.0%. Black residents' share of Rock County's population has remained roughly unchanged at 0.1%.

Rock County is less Black than neighboring Lyon County (0.4% Black), Pipestone County (1.2% Black), Nobles County (4.6% Black), Minnehaha County (6.3% Black), and Moody County (0.2% Black).

Rock County's Asian Population

43 residents of Rock County, or 0.4% of the population, identify as Asian. The share of Asian residents in Rock County is slightly lower than in Minnesota overall, where 5.1% of the population is Asian. Rock County ranks 40th statewide in terms of Asian residents as a share of the population, out of 87 counties.

Since the 2020 Census, Rock County's Asian population has declined by an estimated 30.6%. Asian residents' share of Rock County's population has remained roughly unchanged at 0.4%.

Rock County is less Asian than neighboring Lyon County (0.5% Asian), Pipestone County (1.1% Asian), Nobles County (4.2% Asian), Minnehaha County (1.6% Asian), and Moody County (1.7% Asian).

Rock County's Hispanic Population

384 residents of Rock County, or 4.0% of the population, identify as Hispanic. The share of Hispanic residents in Rock County is slightly lower than in Minnesota overall, where 6.4% of the population is Hispanic. Rock County ranks 47th statewide in terms of Hispanic residents as a share of the population, out of 87 counties.

Since the 2020 Census, Rock County's Hispanic population has grown by an estimated 5.5%. Hispanic residents' share of Rock County's population has remained roughly unchanged at 4.0%.

Rock County is more Hispanic than neighboring Lyon County (3.9% Hispanic). Rock County is less Hispanic than neighboring Pipestone County (8.6% Hispanic), Nobles County (34.5% Hispanic), Minnehaha County (6.6% Hispanic), and Moody County (5.8% Hispanic).

Rock County's Native American/Other Population

57 residents of Rock County, or 0.6% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Rock County is comparable to the share in Minnesota overall, where 1.2% of the population is Native American/Other. Rock County ranks 61st statewide in terms of Native American/Other residents as a share of the population, out of 87 counties.

Since the 2020 Census, Rock County's Native American/Other population has declined by an estimated 1.7%. Native American/Other residents' share of Rock County's population has remained roughly unchanged at 0.6%.

Rock County is more Native American/Other than neighboring Lyon County (0.1% Native American/Other). Rock County is less Native American/Other than neighboring Pipestone County (1.1% Native American/Other), Minnehaha County (2.1% Native American/Other), and Moody County (12.5% Native American/Other).

Rock County's Multiracial Population

332 residents of Rock County, or 3.5% of the population, identify as Multiracial. The share of Multiracial residents in Rock County is comparable to the share in Minnesota overall, where 4.5% of the population is Multiracial. Rock County ranks 51st statewide in terms of Multiracial residents as a share of the population, out of 87 counties.

Since the 2020 Census, Rock County's Multiracial population has grown by an estimated 16.9%. Multiracial residents' share of Rock County's population has increased from 2.9% to 3.5%.

Rock County is more Multiracial than neighboring Lyon County (1.8% Multiracial). Rock County is less Multiracial than neighboring Pipestone County (3.9% Multiracial), Nobles County (3.8% Multiracial), Minnehaha County (4.9% Multiracial), and Moody County (5.9% 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.