St. Clair County, Michigan: Farm Belt county. In 2024, voted R+35%. Republican peak: R+43 in 1928.
Key facts
- 2024 presidential margin
- R+35MIT Election Lab
- Political typology
- Farm BeltAkashic typology
- Population
- 160,2212024 5-year
- Median household income
- $71,2702024 5-year
- White (non-Hispanic)
- 91.2%2024 5-year
- Black
- 2.2%2024 5-year
- Hispanic / Latino
- 3.7%2024 5-year
- Peak Democratic margin
- D+18 in 1964MIT Election Lab
- Peak Republican margin
- R+43 in 1928MIT Election Lab
- Most similar
- Iosco County, MI · similarity 0.99
2024 results by precinct
2024 precinct map of St. Clair CountyPrecinct-level 2024 presidential results for St. Clair County, with each precinct boundary colored by Democratic-vs-Republican margin.
—
Margin—
Turnout—
Harris +50Trump +50
Real precinct boundaries. Hover for vote totals.
presidential history
Presidential margin, 1876–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1876 | No data |
| 1880 | No data |
| 1884 | No data |
| 1888 | No data |
| 1892 | −1.1% |
| 1896 | −16.1% |
| 1900 | −25.0% |
| 1904 | −42.0% |
| 1908 | −30.2% |
| 1912 | +0.5% |
| 1916 | −16.9% |
| 1920 | −36.5% |
| 1924 | −39.3% |
| 1928 | −43.4% |
| 1932 | −7.5% |
| 1936 | −0.3% |
| 1940 | −20.6% |
| 1944 | −23.7% |
| 1948 | −25.0% |
| 1952 | −38.8% |
| 1956 | −39.0% |
| 1960 | −19.7% |
| 1964 | +18.3% |
| 1968 | −11.3% |
| 1972 | −28.3% |
| 1976 | −7.2% |
| 1980 | −19.0% |
| 1984 | −35.8% |
| 1988 | −21.3% |
| 1992 | −1.7% |
| 1996 | +10.6% |
| 2000 | −0.8% |
| 2004 | −8.2% |
| 2008 | +2.6% |
| 2012 | −7.1% |
| 2016 | −31.4% |
| 2020 | −30.2% |
| 2024 | −34.6% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| R | 30,844 | 64,277 | 96,663 | ||
| R | 31,363 | 59,185 | 92,064 | ||
| R | 24,553 | 49,051 | 78,003 | ||
| R | 33,983 | 39,271 | 74,181 | ||
| D | 40,677 | 38,536 | 80,900 | ||
| R | 36,174 | 42,740 | 79,743 | ||
| R | 33,002 | 33,571 | 68,516 | ||
| D | 28,881 | 22,495 | 60,118 | ||
| R | 23,385 | 24,508 | 66,832 | ||
| R | 20,909 | 32,336 | 53,658 | ||
| R | 16,998 | 36,114 | 53,399 | ||
| R | 20,410 | 31,021 | 55,779 | ||
| R | 22,734 | 26,311 | 49,889 | ||
| R | 15,712 | 28,471 | 45,159 | ||
| R | 16,251 | 21,084 | 42,669 | ||
| D | 24,662 | 17,011 | 41,735 | ||
| R | 18,332 | 27,366 | 45,774 | ||
| R | 12,753 | 29,116 | 41,920 | ||
| R | 12,268 | 27,894 | 40,256 | ||
| R | 10,647 | 17,883 | 28,942 | ||
| R | 11,813 | 19,175 | 31,123 | ||
| R | 12,259 | 18,635 | 30,976 | ||
| R | 12,663 | 12,760 | 27,782 | ||
| R | 12,776 | 14,883 | 28,041 | ||
| R | 7,151 | 18,177 | 25,399 | ||
| R | 2,649 | 6,633 | 10,137 | ||
| R | 2,725 | 6,035 | 9,063 | ||
| R | 4,617 | 6,538 | 11,392 | ||
| O | 3,008 | 2,958 | 10,764 | ||
| R | 3,756 | 7,287 | 11,709 | ||
| R | 3,248 | 8,305 | 12,035 | ||
| R | 4,403 | 7,432 | 12,103 | ||
| R | 5,130 | 7,160 | 12,593 | ||
| R | 5,248 | 5,371 | 11,001 | ||
| — | — | — | — | ||
| — | — | — | — | ||
| — | — | — | — | ||
| — | — | — | — |
Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
25.6%
Irish
12.9%
Polish
11.4%
English
11.1%
Italian
6.3%
French
4.6%
American
4.3%
African American
1.8%
Multiple ancestry combinations reported; no single grouping above 1%.
Sample size too small to break out by ancestry reliably.
American Indian, Alaska Native, Native Hawaiian, and Pacific Islander combined.
Source · American Community Survey 5-year estimates, 2024 release. Hispanic/Latino is an ethnicity that overlaps the race categories, so these shares can total more than 100%. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
2024 ACS
Age distribution by sex
Median age: 44.5 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Median household income
Inflation-adjusted dollars
$71,270
St. Clair County ranks near the middle of US counties.
St. Clair County$71,270
Michigan$72,875
United States$80,734
St. Clair County ranks near the middle of US counties by median household income.
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Poverty rate
All persons below federal poverty line
11.3%
Children face moderate poverty.
Children under 1815.7%
Working age (18–64)10.4%
Seniors (65+)7.9%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
97.5%
speak English only
Spanish1.1%
Other Indo-European0.9%
Other languages0.4%
Asian & Pacific Islander0.2%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 65.7% of residents not counted as adherents by any reporting body.
St. Clair County's R+34.6 margin in 2024 reflects a blue-collar lakeside corridor that has moved steadily away from its mid-century Democratic roots, driven by deindustrialization along the Port Huron waterfront and an aging, predominantly white electorate.
The Republican margin here reached forty-three points in 1928. Between 2020 and 2024 the county moved four points toward the Republican candidate; the 2024 margin was thirty-five points.
A population of 160,221, a 91% non-Hispanic-white share, and a median household income of $71,270 describe an agricultural county. The county's voting pattern over the last decade is most similar to that of Iosco County and Chenango County.
Most similar counties
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
St. Clair County, Michigan. Akashic. https://akashic.app/county/26147/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
More farm belt counties
Frequently asked questions
How did St. Clair County, Michigan vote in 2024?
In 2024, St. Clair County, Michigan voted Republican by 34.6 points (R+35), carried by the Republican candidate. Out of 96,663 votes cast, 30,844 went Democratic and 64,277 went Republican.
What is St. Clair County, Michigan's political typology?
Akashic places St. Clair County, Michigan in the "Farm Belt" typology — Rural Plains and Midwest farm counties — Republican, with modest recent movement. The typology is a data-driven cluster built from vote share, vote swing, race and ethnicity, income, language spoken at home, religion, and ancestry. Across 38 elections in the dataset, the county has voted Democratic 3 times, Republican 30 times, and other 1 times.
When did St. Clair County, Michigan last vote Democratic?
The most recent presidential election in which St. Clair County, Michigan voted Democratic was 2008.
How many people live in St. Clair County, Michigan?
St. Clair County, Michigan has a population of 160,221 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in St. Clair County, Michigan?
Median household income in St. Clair County, Michigan is $71,270 — below the national median of $80,734. The Michigan state median is $72,875.
What is the political history of St. Clair County, Michigan?
Akashic tracks 38 presidential elections in St. Clair County, Michigan from 1876 to 2024. Of those, 3 went Democratic and 30 went Republican. The county's typology — "Farm Belt" — captures where that record, its demographics, and its recent swing place it among American communities.