St. Louis County, Missouri: Realigning Affluent Suburb county. In 2024, voted D+23%. Republican peak: R+42 in 1904.
Key facts
- 2024 presidential margin
- D+23MIT Election Lab
- Political typology
- Realigning Affluent SuburbAkashic typology
- Population
- 995,5692024 5-year
- Median household income
- $82,9362024 5-year
- White (non-Hispanic)
- 62.1%2024 5-year
- Black
- 24.1%2024 5-year
- Hispanic / Latino
- 3.9%2024 5-year
- Peak Democratic margin
- D+24 in 1932MIT Election Lab
- Peak Republican margin
- R+42 in 1904MIT Election Lab
- Most similar
- Gunnison County, CO · similarity 0.99
2024 results by precinct
2024 precinct map of St. Louis CountyPrecinct-level 2024 presidential results for St. Louis 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 | −16.6% |
| 1896 | −29.0% |
| 1900 | −25.3% |
| 1904 | −42.4% |
| 1908 | −36.9% |
| 1912 | −4.9% |
| 1916 | −23.7% |
| 1920 | −32.0% |
| 1924 | −22.1% |
| 1928 | −11.4% |
| 1932 | +23.6% |
| 1936 | +15.8% |
| 1940 | −12.1% |
| 1944 | −5.2% |
| 1948 | −5.2% |
| 1952 | −10.1% |
| 1956 | −6.2% |
| 1960 | +2.6% |
| 1964 | +22.6% |
| 1968 | −3.8% |
| 1972 | −24.3% |
| 1976 | −11.1% |
| 1980 | −14.6% |
| 1984 | −28.0% |
| 1988 | −9.6% |
| 1992 | +8.9% |
| 1996 | +6.4% |
| 2000 | +5.3% |
| 2004 | +9.3% |
| 2008 | +19.9% |
| 2012 | +13.6% |
| 2016 | +16.2% |
| 2020 | +24.0% |
| 2024 | +23.4% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| D | 305,635 | 187,982 | 502,738 | ||
| D | 328,151 | 199,493 | 536,446 | ||
| D | 286,704 | 202,434 | 519,686 | ||
| D | 297,097 | 224,742 | 530,116 | ||
| D | 333,123 | 221,705 | 559,854 | ||
| D | 295,284 | 244,969 | 542,983 | ||
| D | 250,631 | 224,689 | 486,884 | ||
| D | 225,524 | 196,096 | 462,278 | ||
| D | 235,760 | 188,285 | 534,763 | ||
| R | 216,534 | 262,784 | 480,682 | ||
| R | 173,144 | 307,684 | 480,828 | ||
| R | 192,796 | 263,518 | 484,831 | ||
| R | 196,915 | 246,988 | 452,626 | ||
| R | 160,801 | 264,147 | 424,948 | ||
| R | 165,786 | 180,355 | 385,375 | ||
| D | 213,658 | 134,962 | 348,620 | ||
| D | 166,508 | 157,992 | 324,500 | ||
| R | 121,881 | 138,111 | 259,992 | ||
| R | 95,457 | 116,821 | 212,480 | ||
| R | 62,684 | 69,592 | 133,383 | ||
| R | 57,780 | 64,131 | 122,266 | ||
| R | 52,380 | 66,909 | 119,747 | ||
| D | 63,226 | 45,541 | 112,100 | ||
| D | 59,044 | 35,872 | 98,257 | ||
| R | 33,802 | 42,572 | 76,667 | ||
| R | 16,075 | 26,669 | 47,834 | ||
| R | 12,438 | 25,008 | 39,342 | ||
| R | 7,587 | 12,485 | 20,666 | ||
| R | 5,409 | 6,177 | 15,526 | ||
| R | 4,522 | 10,177 | 15,326 | ||
| R | 2,870 | 7,375 | 10,619 | ||
| R | 3,864 | 6,537 | 10,573 | ||
| R | 3,403 | 6,210 | 9,689 | ||
| R | 3,116 | 4,367 | 7,552 | ||
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Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
22.3%
Irish
12.2%
English
9.1%
American
5.5%
Italian
4.6%
Polish
2.4%
French
2.4%
African American
19.3%
Multiple ancestry combinations reported; no single grouping above 1%.
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: 40.3 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
$82,936
St. Louis County ranks in the top 25% of US counties.
St. Louis County$82,936
Missouri$70,702
United States$80,734
St. Louis County ranks in the top 25% 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
9.8%
Child poverty is below the national average.
Children under 1813.5%
Working age (18–64)8.7%
Seniors (65+)9.1%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
89.5%
speak English only
Other Indo-European3.8%
Asian & Pacific Islander3.0%
Spanish2.6%
Other languages1.1%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 49.3% of residents not counted as adherents by any reporting body.
With over a million residents and a 23-point Democratic lean in 2024, St. Louis County functions as the state's largest counterweight to rural Republican dominance, shaped by a mix of inner-ring suburbs and diverse urban communities.
Once reliably Republican — a margin of forty-two points in 1904 at its widest — St. Louis County has trended Democratic. Between 2020 and 2024 the county moved one point toward the Republican candidate; the 2024 margin was twenty-three points.
A median household income of $82,936 — among the higher at this geographic scale — and a population of 995,569 describe the county. The county's voting pattern over the last decade is most similar to that of Gunnison County and Summit 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. Louis County, Missouri. Akashic. https://akashic.app/county/29189/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
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Frequently asked questions
How did St. Louis County, Missouri vote in 2024?
In 2024, St. Louis County, Missouri voted Democratic by 23.4 points (D+23), carried by the Democratic candidate. Out of 502,738 votes cast, 305,635 went Democratic and 187,982 went Republican.
What is St. Louis County, Missouri's political typology?
Akashic places St. Louis County, Missouri in the "Realigning Affluent Suburb" typology — College-educated, affluent suburbs — the one bloc moving toward the Democratic Party. 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 13 times, Republican 21 times, and other 0 times.
When did St. Louis County, Missouri last vote Republican?
The most recent presidential election in which St. Louis County, Missouri voted Republican was 1988.
How many people live in St. Louis County, Missouri?
St. Louis County, Missouri has a population of 995,569 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in St. Louis County, Missouri?
Median household income in St. Louis County, Missouri is $82,936 — above the national median of $80,734. The Missouri state median is $70,702.
What is the political history of St. Louis County, Missouri?
Akashic tracks 38 presidential elections in St. Louis County, Missouri from 1876 to 2024. Of those, 13 went Democratic and 21 went Republican. The county's typology — "Realigning Affluent Suburb" — captures where that record, its demographics, and its recent swing place it among American communities.