- Lead
- 34,627
- Total
- 43,462
- vs nation
- D+81.1
Maryland 40th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 39,278
- Total
- 46,785
- vs nation
- D+79.5
- Lead
- 45,679
- Total
- 54,714
- vs nation
- D+81.4
- Lead
- 49,818
- Total
- 58,855
- vs nation
- D+80.8
- Lead
- 48,052
- Total
- 56,745
- vs nation
- D+77.4
- Lead
- 37,343
- Total
- 48,274
- vs nation
- D+79.8
- Lead
- 34,736
- Total
- 44,143
- vs nation
- D+78.2
- Lead
- 31,298
- Total
- 41,352
- vs nation
- D+67.2
Key facts
- 2024 presidential margin
- D+79.7MIT Election Lab
- Population
- 124,3052024 5-year
- Population density
- 8,754 / sq mi2024 5-year · TIGER/Line
- Land area
- 14.2 sq miTIGER/Line
- Median household income
- $47,0942024 5-year
- White (non-Hispanic)
- 21.0%2024 5-year
- Black
- 66.2%2024 5-year
- Hispanic / Latino
- 4.4%2024 5-year
- Peak Democratic margin
- D+84.7 in 2008MIT Election Lab
- Most similar
- State Senate District 45, MD · twin score 99.6
presidential history
Party record book
Maryland 40th State Senate District · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1892–2024 (partial returns from 1876) · 38 presidential cycles · 38 with a vote-share denominator · 34 with a national benchmark
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Barack Obama2008
91.9%
52,146 votes · D+84.7 · modeled estimate
Runner-up · Barack Obama, 2012 · 91.5%
Republican
William McKinley1896
46.0%
9,106 votes · D+4.3 · modeled estimate
Runner-up · Warren G. Harding, 1920 · 44.2%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Lyndon B. Johnson1964
58,565votes
84.3% of the vote · D+68.5 · modeled estimate
Runner-up · Barack Obama, 2012 · 53,881 votes
Republican
Dwight D. Eisenhower1956
25,678votes
42.9% of the vote · D+14.2 · modeled estimate
Runner-up · Dwight D. Eisenhower, 1952 · 24,133 votes
Best relative to the U.S.
This Place’s margin against the national margin in the same election — positive when it leaned toward the party more than the country did.
Democratic
Hillary Clinton2016
+81.4pts D vs U.S.
Place D+83.5 · U.S. D+2.1 · modeled estimate
Runner-up · Kamala Harris, 2024 · +81.1 pts
Republican
William McKinley1896
−10.3pts R vs U.S.
Place D+4.3 · U.S. R+6.1 · modeled estimate
Runner-up · William H. Taft, 1912 · −24.8 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
Senate and governor results are in the Office selector at the top of this page.
U.S. House
Each row is a county-allocated estimate of U.S. House votes for this district — county returns apportioned onto its boundary, not precinct-counted. “Vote lead” is the estimated local lead here, not necessarily the winner of the full contest.
Maryland's 40th Senate District recorded a D+79.7 margin in 2024, placing it among the most concentrated partisan geographies in the country — a pattern that shapes both turnout dynamics and candidate strategy within the district.
Across the recorded series it reached a Democratic high of 84.7 points in 2008. Between 2020 and 2024 the district moved 4.3 points toward the Republican candidate; the 2024 margin was 79.7 points.
A population of 124,305, a 21% non-Hispanic-white share, and a median household income of $47,094 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 45 and State Senate District 41.
The state-senate districts 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.
District research tools
Open the source-auditable district brief for electoral baseline, electorate, current-cycle coverage, geography, official dates, and methodology. Open campaign intelligence report → · Browse all comparisons →
Maryland 40th State Senate District. Akashic. https://akashic.app/sld-upper/24040/. Accessed May 20, 2026. License: CC BY 4.0.