St. Clair County Demographics

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

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	143,658	142,396	89.7%	88.8%
Hispanic	5,905	5,505	3.7%	3.4%
Multiracial	5,764	6,883	3.6%	4.3%
Black	3,395	3,773	2.1%	2.4%
Asian	785	809	0.5%	0.5%
Native American/Other	714	1,017	0.4%	0.6%

St. Clair County, Michigan has an estimated population of 160,221, a less than 1% change from the 160,383 recorded in the 2020 Census. The population is 89.7% White, 3.7% Hispanic, 3.6% Multiracial, 2.1% Black, 0.5% Asian, and 0.4% Native American/Other. This demographic dot map shows the population of St. Clair County, with one dot drawn for each person counted by the Census, color-coded by race.

St. Clair has become less racially diverse since the 2020 Census. It is considerably less diverse than Michigan overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In St. Clair County, that probability was 20.8% in 2020 and 19.3% in the most recent ACS estimates.

St. Clair County is ranked the 13th most populous county in Michigan, out of 83 counties. St. Clair County was ranked the 13th most populous county in the 2020 Census.

St. Clair County's White Population

143,658 residents of St. Clair County, or 89.7% of the population, identify as White. The share of White residents in St. Clair County is significantly higher than in Michigan overall, where 72.4% of the population is White. St. Clair County ranks 43rd statewide in terms of White residents as a share of the population, out of 83 counties.

Since the 2020 Census, St. Clair County's White population has remained roughly the same. White residents' share of St. Clair County's population has increased from 88.8% to 89.7%.

St. Clair County is more White than neighboring Macomb County (74.1% White), Oakland County (68.2% White), and Wayne County (47.9% White). St. Clair County is less White than neighboring Sanilac County (91.9% White).

St. Clair County's Black Population

3,395 residents of St. Clair County, or 2.1% of the population, identify as Black. The share of Black residents in St. Clair County is considerably lower than in Michigan overall, where 13.1% of the population is Black. St. Clair County ranks 29th statewide in terms of Black residents as a share of the population, out of 83 counties.

Since the 2020 Census, St. Clair County's Black population has declined by an estimated 10.0%. Black residents' share of St. Clair County's population has remained roughly unchanged at 2.1%.

St. Clair County is more Black than neighboring Sanilac County (0.4% Black), and Lapeer County (1% Black). St. Clair County is less Black than neighboring Macomb County (12.7% Black), Oakland County (12.7% Black), and Wayne County (36.6% Black).

St. Clair County's Asian Population

785 residents of St. Clair County, or 0.5% of the population, identify as Asian. The share of Asian residents in St. Clair County is slightly lower than in Michigan overall, where 3.4% of the population is Asian. St. Clair County ranks 37th statewide in terms of Asian residents as a share of the population, out of 83 counties.

Since the 2020 Census, St. Clair County's Asian population has declined by an estimated 3.0%. Asian residents' share of St. Clair County's population has remained roughly unchanged at 0.5%.

St. Clair County is more Asian than neighboring Sanilac County (0.3% Asian), and Lapeer County (0.3% Asian). St. Clair County is less Asian than neighboring Macomb County (5.1% Asian), Oakland County (8.5% Asian), and Wayne County (3.7% Asian).

St. Clair County's Hispanic Population

5,905 residents of St. Clair County, or 3.7% of the population, identify as Hispanic. The share of Hispanic residents in St. Clair County is slightly lower than in Michigan overall, where 5.9% of the population is Hispanic. St. Clair County ranks 35th statewide in terms of Hispanic residents as a share of the population, out of 83 counties.

Since the 2020 Census, St. Clair County's Hispanic population has grown by an estimated 7.3%. Hispanic residents' share of St. Clair County's population has remained roughly unchanged at 3.7%.

St. Clair County is more Hispanic than neighboring Macomb County (3.2% Hispanic). St. Clair County is less Hispanic than neighboring Sanilac County (4.3% Hispanic), Lapeer County (5% Hispanic), Oakland County (5% Hispanic), and Wayne County (6.9% Hispanic).

St. Clair County's Native American/Other Population

714 residents of St. Clair County, or 0.4% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in St. Clair County is comparable to the share in Michigan overall, where 0.8% of the population is Native American/Other. St. Clair County ranks 60th statewide in terms of Native American/Other residents as a share of the population, out of 83 counties.

Since the 2020 Census, St. Clair County's Native American/Other population has declined by an estimated 29.8%. Native American/Other residents' share of St. Clair County's population has remained roughly unchanged at 0.4%.

St. Clair County is less Native American/Other than neighboring Macomb County (0.6% Native American/Other), Lapeer County (0.5% Native American/Other), Oakland County (0.7% Native American/Other), and Wayne County (0.7% Native American/Other).

St. Clair County's Multiracial Population

5,764 residents of St. Clair County, or 3.6% of the population, identify as Multiracial. The share of Multiracial residents in St. Clair County is comparable to the share in Michigan overall, where 4.5% of the population is Multiracial. St. Clair County ranks 33rd statewide in terms of Multiracial residents as a share of the population, out of 83 counties.

Since the 2020 Census, St. Clair County's Multiracial population has declined by an estimated 16.3%. Multiracial residents' share of St. Clair County's population has decreased from 4.3% to 3.6%.

St. Clair County is more Multiracial than neighboring Sanilac County (2.8% Multiracial), and Lapeer County (3.5% Multiracial). St. Clair County is less Multiracial than neighboring Macomb County (4.4% Multiracial), Oakland County (4.8% Multiracial), and Wayne County (4.3% 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.