2024 results by precinct
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Margin—
Turnout—
Harris +50Trump +50
Real precinct boundaries. Hover for vote totals.
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 23,531 | 33,582 | 58,954 | |
| 2020 | R | 23,138 | 30,826 | 55,665 | |
| 2016 | R | 17,534 | 28,663 | 48,975 | |
| 2012 | R | 19,711 | 26,797 | 47,824 | |
| 2008 | R | 19,023 | 24,705 | 44,409 | |
| 2004 | R | 13,776 | 23,725 | 37,916 | |
| 2000 | R | 11,912 | 16,856 | 29,501 | |
| 1996 | R | 9,988 | 11,835 | 23,808 | |
| 1992 | R | 8,931 | 11,485 | 25,085 | |
| 1988 | R | 7,434 | 12,767 | 20,290 | |
| 1984 | R | 6,420 | 11,201 | 17,670 | |
| 1980 | R | 6,773 | 8,267 | 16,056 | |
| 1976 | D | 7,227 | 5,640 | 12,867 | |
| 1972 | R | 3,571 | 7,689 | 11,382 | |
| 1968 | R | 3,280 | 3,348 | 9,175 | |
| 1964 | D | 5,831 | 2,878 | 8,709 | |
| 1960 | D | 5,752 | 3,080 | 8,832 | |
| 1956 | R | 3,443 | 4,336 | 7,779 | |
| 1952 | R | 3,588 | 4,270 | 7,891 | |
| 1948 | D | 2,293 | 2,247 | 4,606 | |
| 1944 | R | 1,891 | 2,673 | 4,564 | |
| 1940 | D | 2,860 | 2,301 | 5,205 | |
| 1936 | D | 2,829 | 2,286 | 5,239 | |
| 1932 | D | 2,885 | 1,322 | 4,300 | |
| 1928 | D | 3,006 | 1,609 | 4,733 | |
| 1924 | D | 1,949 | 1,653 | 3,703 | |
| 1920 | R | 1,861 | 2,175 | 4,094 | |
| 1916 | D | 1,443 | 1,064 | 2,611 | |
| 1912 | D | 3,669 | 1,262 | 2,336 | |
| 1908 | D | 3,637 | 1,627 | 130 | |
| 1904 | D | 5,221 | 1,874 | 183 | |
| 1900 | R | 2,017 | 2,855 | 33 | |
| 1896 | R | 2,084 | 2,646 | 5,209 | |
| 1892 | R | 1,638 | 1,819 | 3,991 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Demographics
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
American
100.0%
Polish
0.6%
African American
11.7%
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. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
Age distribution by sex
Median age: 37.2 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.
Median household income
2024 inflation-adjusted dollars
$119,446
St. Mary's County ranks in the top 0.5% of US counties.
St. Mary's County$119,446
Maryland$103,678
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
8.0%
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
Source · 2020 US Religion Census. Remaining 55.6% of residents not counted as adherents by any reporting body.
Home to one of the Navy's premier flight test centers, St. Mary's combines a substantial military and federal-contractor workforce with rural Southern Maryland demographics that have trended steadily Republican over the past two decades.
The Republican margin in St. Mary's County reached its widest at 100 points in 1900. The margin in 2024 was seventeen points, in line with the county's deep historical pattern.
St. Mary's County's loyalty is rooted in its place. Median household income of $119,446, a 71% non-Hispanic-white share, and a population of 115,126 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 Washington County and Montour County.
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