St. Clair County, Michigan

2024 results by precinct

128 precincts · 96,663 votes cast

Trump · R+35

Harris +50

Trump +50

Real precinct boundaries. Hover for vote totals.

38 presidential elections

Year	Won	Margin	Democratic	Republican	Total
2024	R	−34.6%	30,844	64,277	96,663
2020	R	−30.2%	31,363	59,185	92,064
2016	R	−31.4%	24,553	49,051	78,003
2012	R	−7.1%	33,983	39,271	74,181
2008	D	+2.6%	40,677	38,536	80,900
2004	R	−8.2%	36,174	42,740	79,743
2000	R	−0.8%	33,002	33,571	68,516
1996	D	+10.6%	28,881	22,495	60,118
1992	R	−1.7%	23,385	24,508	66,832
1988	R	−21.3%	20,909	32,336	53,658
1984	R	−35.8%	16,998	36,114	53,399
1980	R	−19.0%	20,410	31,021	55,779
1976	R	−7.2%	22,734	26,311	49,889
1972	R	−28.3%	15,712	28,471	45,159
1968	R	−11.3%	16,251	21,084	42,669
1964	D	+18.3%	24,662	17,011	41,735
1960	R	−19.7%	18,332	27,366	45,774
1956	R	−39.0%	12,753	29,116	41,920
1952	R	−38.8%	12,268	27,894	40,256
1948	R	−25.0%	10,647	17,883	28,942
1944	R	−23.7%	11,813	19,175	31,123
1940	R	−20.6%	12,259	18,635	30,976
1936	R	−0.3%	12,663	12,760	27,782
1932	R	−7.5%	12,776	14,883	28,041
1928	R	−43.4%	7,151	18,177	25,399
1924	R	−39.3%	2,649	6,633	10,137
1920	R	−36.5%	2,725	6,035	9,063
1916	R	−16.9%	4,617	6,538	11,392
1912	D	+0.5%	3,008	2,958	10,764
1908	R	−30.2%	3,756	7,287	11,709
1904	R	−42.0%	3,248	8,305	12,035
1900	R	−25.0%	4,403	7,432	12,103
1896	R	−16.1%	5,130	7,160	12,593
1892	R	−1.1%	5,248	5,371	11,001
1888	—	No data	—	—	—
1884	—	No data	—	—	—
1880	—	No data	—	—	—
1876	—	No data	—	—	—

Demographics

Race, ethnicity, and ancestry

Click any group to see the ancestries typically reported within it.

American

100.0%

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. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.

Age distribution by sex

Median age: 44.5 in this county, 39.1 nationally

Male

Age

Female

0.9%

85+

1.4%

2.5%

75–84

3.1%

6.1%

65–74

6.4%

8.0%

55–64

7.9%

6.6%

45–54

6.5%

5.6%

35–44

5.8%

5.9%

25–34

5.5%

4.0%

18–24

3.6%

8.0%

5–17

7.4%

2.5%

2.4%

Source · American Community Survey 5-year estimates, 2024 release.

Median household income

2024 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

Source · American Community Survey 5-year estimates, 2024 release.

Poverty rate

All persons below federal poverty line

11.3%

Children face moderate poverty.

Children under 1818.0%

Working age (18–64)100.0%

Seniors (65+)18.0%

Source · American Community Survey 5-year estimates, 2024 release.

Language at home

Population aged 5 and older

0.0%

speak English only

Source · ACS 5-year estimates, 2024.

Religious adherents

Adherents per capita by tradition

Catholic & Orthodox

14.5%

Other Christian

6.6%

Mainline Protestant

4.5%

Baptist

3.0%

Pentecostal & Holiness

2.5%

Methodist

1.8%

Non-Christian

1.4%

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 in St. Clair County reached its widest at forty-three points in 1928. The margin in 2024 was thirty-five points, in line with the county's deep historical pattern.

St. Clair County's loyalty is rooted in its place. Median household income of $71,270, a 91% non-Hispanic-white share, and a population of 160,221 together describe a community whose political habits are deeply settled. The county's voting pattern over the last decade is most similar to that of Iosco County and Chenango County.

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St. Clair County has voted Republican for as long as anyone can remember.