St. Croix County Demographics

A map of St. Croix County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	87,799	85,457	91.4%	91.4%
Multiracial	3,151	3,206	3.3%	3.4%
Hispanic	2,935	2,679	3.1%	2.9%
Asian	1,064	984	1.1%	1.1%
Black	643	635	0.7%	0.7%
Native American/Other	441	575	0.5%	0.6%

St. Croix County, Wisconsin has an estimated population of 96,033, a slight increase from the 93,536 recorded in the 2020 Census. The population is 91.4% White, 3.3% Multiracial, 3.1% Hispanic, 1.1% Asian, 0.7% Black, and 0.5% Native American/Other. This demographic dot map shows the population of St. Croix County, with one dot drawn for each person counted by the Census, color-coded by race.

St. Croix is about as racially diverse as it was in the 2020 Census. It is considerably less diverse than Wisconsin overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In St. Croix County, that probability was 16.3% in 2020 and 16.2% in the most recent ACS estimates.

St. Croix County is ranked the 17th most populous county in Wisconsin, out of 72 counties. St. Croix County was ranked the 17th most populous county in the 2020 Census.

St. Croix County's White Population

87,799 residents of St. Croix County, or 91.4% of the population, identify as White. The share of White residents in St. Croix County is considerably higher than in Wisconsin overall, where 78.6% of the population is White. St. Croix County ranks 25th statewide in terms of White residents as a share of the population, out of 72 counties.

Since the 2020 Census, St. Croix County's White population has grown by an estimated 2.7%. White residents' share of St. Croix County's population has remained roughly unchanged at 91.4%.

St. Croix County is more White than neighboring Pierce County (91.3% White), Washington County (77.2% White), and Dunn County (90.5% White). St. Croix County is less White than neighboring Polk County (93% White), and Pepin County (94.1% White).

St. Croix County's Black Population

643 residents of St. Croix County, or 0.7% of the population, identify as Black. The share of Black residents in St. Croix County is lower than in Wisconsin overall, where 5.9% of the population is Black. St. Croix County ranks 39th statewide in terms of Black residents as a share of the population, out of 72 counties.

Since the 2020 Census, St. Croix County's Black population has grown by an estimated 1.3%. Black residents' share of St. Croix County's population has remained roughly unchanged at 0.7%.

St. Croix County is more Black than neighboring Pierce County (0.6% Black), Polk County (0.2% Black), and Pepin County (0.4% Black). St. Croix County is less Black than neighboring Washington County (5.5% Black), and Dunn County (0.9% Black).

St. Croix County's Asian Population

1,064 residents of St. Croix County, or 1.1% of the population, identify as Asian. The share of Asian residents in St. Croix County is comparable to the share in Wisconsin overall, where 2.9% of the population is Asian. St. Croix County ranks 23rd statewide in terms of Asian residents as a share of the population, out of 72 counties.

Since the 2020 Census, St. Croix County's Asian population has grown by an estimated 8.1%. Asian residents' share of St. Croix County's population has remained roughly unchanged at 1.1%.

St. Croix County is more Asian than neighboring Polk County (0.5% Asian), and Pepin County (0.6% Asian). St. Croix County is less Asian than neighboring Pierce County (1.2% Asian), Washington County (7.7% Asian), and Dunn County (3.1% Asian).

St. Croix County's Hispanic Population

2,935 residents of St. Croix County, or 3.1% of the population, identify as Hispanic. The share of Hispanic residents in St. Croix County is slightly lower than in Wisconsin overall, where 8% of the population is Hispanic. St. Croix County ranks 42nd statewide in terms of Hispanic residents as a share of the population, out of 72 counties.

Since the 2020 Census, St. Croix County's Hispanic population has grown by an estimated 9.6%. Hispanic residents' share of St. Croix County's population has remained roughly unchanged at 3.1%.

St. Croix County is more Hispanic than neighboring Pierce County (3% Hispanic), Polk County (2.2% Hispanic), Dunn County (2.5% Hispanic), and Pepin County (2.7% Hispanic). St. Croix County is less Hispanic than neighboring Washington County (5.3% Hispanic).

St. Croix County's Native American/Other Population

441 residents of St. Croix County, or 0.5% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in St. Croix County is comparable to the share in Wisconsin overall, where 0.9% of the population is Native American/Other. St. Croix County ranks 47th statewide in terms of Native American/Other residents as a share of the population, out of 72 counties.

Since the 2020 Census, St. Croix County's Native American/Other population has declined by an estimated 23.3%. Native American/Other residents' share of St. Croix County's population has remained roughly unchanged at 0.5%.

St. Croix County is less Native American/Other than neighboring Polk County (0.8% Native American/Other), Washington County (0.7% Native American/Other), and Pepin County (0.6% Native American/Other).

St. Croix County's Multiracial Population

3,151 residents of St. Croix County, or 3.3% of the population, identify as Multiracial. The share of Multiracial residents in St. Croix County is comparable to the share in Wisconsin overall, where 3.7% of the population is Multiracial. St. Croix County ranks 18th statewide in terms of Multiracial residents as a share of the population, out of 72 counties.

Since the 2020 Census, St. Croix County's Multiracial population has declined by an estimated 1.7%. Multiracial residents' share of St. Croix County's population has remained roughly unchanged at 3.3%.

St. Croix County is more Multiracial than neighboring Dunn County (2.6% Multiracial), and Pepin County (1.6% Multiracial). St. Croix County is less Multiracial than neighboring Pierce County (3.4% Multiracial), Polk County (3.4% Multiracial), and Washington 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.