St. Mary's County, Maryland
Precinct data
Results by precinct
27 precincts · 58,954 votes
Precinct boundaries and identifiers are cycle-specific. This table does not join rows across years without a validated crosswalk.
| Precinct -05-00105-001 | 1,749 | 4,874 | 165 | 6,788 | 25.8% | 71.8% | R+46.0 |
|---|---|---|---|---|---|---|---|
| Precinct -04-00104-001 | 1,541 | 4,214 | 111 | 5,866 | 26.3% | 71.8% | R+45.6 |
| Precinct -02-00102-001 | 1,600 | 2,616 | 153 | 4,369 | 36.6% | 59.9% | R+23.3 |
| Precinct -08-00108-001 | 2,533 | 1,399 | 133 | 4,065 | 62.3% | 34.4% | D+27.9 |
| Precinct -03-00203-002 | 1,388 | 2,014 | 93 | 3,495 | 39.7% | 57.6% | R+17.9 |
| Precinct -06-00106-001 | 994 | 2,222 | 89 | 3,305 | 30.1% | 67.2% | R+37.2 |
| Precinct -08-00308-003 | 1,576 | 1,118 | 123 | 2,817 | 55.9% | 39.7% | D+16.3 |
| Precinct -03-00103-001 | 1,229 | 1,235 | 86 | 2,550 | 48.2% | 48.4% | R+0.2 |
| Precinct -08-00508-005 | 1,234 | 1,196 | 89 | 2,519 | 49.0% | 47.5% | D+1.5 |
| Precinct -03-00403-004 | 969 | 1,346 | 88 | 2,403 | 40.3% | 56.0% | R+15.7 |
| Precinct -08-00408-004 | 1,322 | 955 | 88 | 2,365 | 55.9% | 40.4% | D+15.5 |
| Precinct -06-00306-003 | 556 | 1,314 | 56 | 1,926 | 28.9% | 68.2% | R+39.4 |
| Precinct -01-00101-001 | 853 | 999 | 68 | 1,920 | 44.4% | 52.0% | R+7.6 |
| Precinct -07-00107-001 | 570 | 1,301 | 40 | 1,911 | 29.8% | 68.1% | R+38.3 |
| Precinct -08-00708-007 | 1,155 | 645 | 72 | 1,872 | 61.7% | 34.5% | D+27.2 |
| Precinct -08-00208-002 | 694 | 856 | 62 | 1,612 | 43.1% | 53.1% | R+10.0 |
| Precinct -03-00303-003 | 543 | 978 | 42 | 1,563 | 34.7% | 62.6% | R+27.8 |
| Precinct -06-00206-002 | 391 | 1,083 | 33 | 1,507 | 25.9% | 71.9% | R+45.9 |
| Precinct -08-00808-008 | 685 | 637 | 62 | 1,384 | 49.5% | 46.0% | D+3.5 |
| Precinct -01-00201-002 | 472 | 781 | 44 | 1,297 | 36.4% | 60.2% | R+23.8 |
| Precinct -08-00608-006 | 531 | 613 | 50 | 1,194 | 44.5% | 51.3% | R+6.9 |
| Precinct -03-00503-005 | 450 | 373 | 37 | 860 | 52.3% | 43.4% | D+9.0 |
| Precinct -06-00406-004 | 279 | 443 | 35 | 757 | 36.9% | 58.5% | R+21.7 |
| Precinct -08-00908-009 | 119 | 258 | 12 | 389 | 30.6% | 66.3% | R+35.7 |
| Precinct -09-00109-001 | 70 | 87 | 4 | 161 | 43.5% | 54.0% | R+10.6 |
| Precinct -03-00603-006 | 27 | 29 | 0 | 56 | 48.2% | 51.8% | R+3.6 |
| Precinct -08-01008-010 | 1 | 2 | 0 | 3 | 33.3% | 66.7% | R+33.3 |
Presidential margin, 1892–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1892 | −4.5% |
| 1896 | −10.8% |
| 1900 | No data |
| 1904 | No data |
| 1908 | No data |
| 1912 | No data |
| 1916 | +14.5% |
| 1920 | −7.7% |
| 1924 | +8.0% |
| 1928 | +29.5% |
| 1932 | +36.3% |
| 1936 | +10.4% |
| 1940 | +10.7% |
| 1944 | −17.1% |
| 1948 | +1.0% |
| 1952 | −8.6% |
| 1956 | −11.5% |
| 1960 | +30.3% |
| 1964 | +33.9% |
| 1968 | −0.7% |
| 1972 | −36.2% |
| 1976 | +12.3% |
| 1980 | −9.3% |
| 1984 | −27.1% |
| 1988 | −26.3% |
| 1992 | −10.2% |
| 1996 | −7.8% |
| 2000 | −16.8% |
| 2004 | −26.2% |
| 2008 | −12.8% |
| 2012 | −14.8% |
| 2016 | −22.7% |
| 2020 | −13.8% |
| 2024 | −17.0% |
U.S. Senate
Registered voters
By party of registration, over time
Registration leans Republican; the presidential vote runs 6.3 points more Democratic.
79,426 registered voters · 2026
Who moves in and out
Net migration over time, and who arrivals are — where they came from and what those places vote
+36 net domestic migration · 2025
Net +947 over 2011–2025 · gain loss
Arrivals reported $70,103 in average income, against $103,294 for residents who stayed — 32% lower. (IRS SOI, 2022–23)
The places arrivals came from lean D+29.9 on average — 47 points more Democratic-leaning than St. Mary's County, MD itself (R+17.0).
Where arrivals came from lean of each source
- Charles County, MD462D+40.5
- Calvert County, MD315R+10.9
- Prince George's County, MD231D+74.8
- Anne Arundel County, MD91D+13.8
- San Diego County, CA69D+16.8
- Virginia Beach city, VA59D+2.6
Where departures went households, 2022–23
- Charles County, MD326
- Calvert County, MD295
- Prince George's County, MD108
- Anne Arundel County, MD99
- Fairfax County, VA60
- Montgomery County, MD50
Migration is one input to a place’s political change, not its cause — a shift can also come from residents changing their minds, generational turnover, or turnout. These figures describe the places people moved between; they do not measure how any mover voted.
| Year | Net domestic migration |
|---|---|
| 2011 | +890 |
| 2012 | +262 |
| 2013 | −393 |
| 2014 | −71 |
| 2015 | +150 |
| 2016 | −11 |
| 2017 | +106 |
| 2018 | −300 |
| 2019 | +288 |
| 2021 | +59 |
| 2022 | −332 |
| 2023 | −123 |
| 2024 | +386 |
| 2025 | +36 |
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.
Across the recorded series it reached a Democratic high of 36.3 points in 1932 and a Republican high of 36.2 points in 1972. Between 2020 and 2024 the county moved 3.2 points toward the Republican candidate; the 2024 margin was 17.0 points.
A population of 115,126, a 70% non-Hispanic-white share, and a median household income of $119,446 describe the county. The county's voting pattern over the last decade is most similar to that of Calvert County and Harford County.
The counties whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.
Browse places by community — income, education, race & ethnicity, language — all community cuts →
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 →
St. Mary's County, Maryland. Akashic. https://akashic.app/county/24037/. Accessed May 20, 2026. License: CC BY 4.0.