- Lead
- 1,780
- Total
- 25,577
- vs nation
- R+5.5
Maryland State Legislative Subdistrict 30B
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 1,367
- Total
- 25,283
- vs nation
- R+9.9
- Lead
- 3,450
- Total
- 20,430
- vs nation
- R+19.0
- Lead
- 3,969
- Total
- 20,192
- vs nation
- R+23.5
- Lead
- 4,331
- Total
- 20,301
- vs nation
- R+28.6
- Lead
- 6,030
- Total
- 19,124
- vs nation
- R+29.1
- Lead
- 4,159
- Total
- 15,827
- vs nation
- R+26.8
- Lead
- 3,311
- Total
- 13,480
- vs nation
- R+33.1
Key facts
- 2024 presidential margin
- R+7.0MIT Election Lab
- Population
- 42,3332024 5-year
- Population density
- 399 / sq mi2024 5-year · TIGER/Line
- Land area
- 106 sq miTIGER/Line
- Median household income
- $148,5542024 5-year
- White (non-Hispanic)
- 78.9%2024 5-year
- Black
- 6.8%2024 5-year
- Hispanic / Latino
- 7.4%2024 5-year
- Peak Democratic margin
- D+6.2 in 1932MIT Election Lab
- Peak Republican margin
- R+60.3 in 1972MIT Election Lab
- Most similar
- State Legislative District 4, MD · twin score 90.0
presidential history
Party record book
Maryland State Legislative Subdistrict 30B · 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
Franklin D. Roosevelt1932
52.0%
600 votes · D+6.2 · modeled estimate
Runner-up · Lyndon B. Johnson, 1964 · 48.4%
Republican
Richard Nixon1972
79.5%
6,715 votes · R+60.3 · modeled estimate
Runner-up · Ronald Reagan, 1984 · 74.4%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
11,635votes
46.0% of the vote · R+5.4 · modeled estimate
Runner-up · Kamala Harris, 2024 · 11,479 votes
Republican
Donald Trump2024
13,259votes
51.8% of the vote · R+7.0 · modeled estimate
Runner-up · Donald Trump, 2020 · 13,002 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
John W. Davis1924
+5.1pts D vs U.S.
Place R+20.1 · U.S. R+25.2 · modeled estimate
Runner-up · Alton B. Parker, 1904 · −1.4 pts
Republican
George H. W. Bush1988
+37.6pts R vs U.S.
Place R+45.3 · U.S. R+7.7 · modeled estimate
Runner-up · Richard Nixon, 1972 · +37.2 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 State Legislative Subdistrict 30B sits in the Mid-Atlantic. In 2024 it voted Republican.
Across the recorded series it reached a Democratic high of 6.2 points in 1932 and a Republican high of 60.3 points in 1972. Between 2020 and 2024 the district moved 1.6 points toward the Republican candidate; the 2024 margin was 7.0 points.
A population of 42,333, a 79% non-Hispanic-white share, and a median household income of $148,554 describe the district. The district's voting pattern over the last decade is most similar to that of State Legislative District 4 and State Legislative Subdistrict 42A.
The state-house 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 State Legislative Subdistrict 30B. Akashic. https://akashic.app/sld-lower/2430B/. Accessed May 20, 2026. License: CC BY 4.0.