- Lead
- 18,250
- Total
- 145,904
- vs nation
- D+14.0
Michigan 21st State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 22,885
- Total
- 145,776
- vs nation
- D+11.2
- Lead
- 14,035
- Total
- 127,512
- vs nation
- D+8.9
- Lead
- 18,511
- Total
- 123,395
- vs nation
- D+11.1
- Lead
- 27,863
- Total
- 134,070
- vs nation
- D+13.5
- Lead
- 5,138
- Total
- 127,192
- vs nation
- D+6.5
- Lead
- 8,070
- Total
- 113,998
- vs nation
- D+6.6
- Lead
- 8,709
- Total
- 107,692
- vs nation
- R+0.4
Key facts
- 2024 presidential margin
- D+12.5MIT Election Lab
- Population
- 263,3612024 5-year
- Population density
- 299 / sq mi2024 5-year · TIGER/Line
- Land area
- 880 sq miTIGER/Line
- Median household income
- $69,7872024 5-year
- White (non-Hispanic)
- 70.2%2024 5-year
- Black
- 11.8%2024 5-year
- Hispanic / Latino
- 8.7%2024 5-year
- Peak Democratic margin
- D+20.8 in 2008MIT Election Lab
- Peak Republican margin
- R+62.4 in 1924MIT Election Lab
- Most similar
- State Senate District 28, MI · twin score 88.0
presidential history
Party record book
Michigan 21st 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
Lyndon B. Johnson1964
59.6%
40,526 votes · D+19.4 · modeled estimate
Runner-up · Barack Obama, 2008 · 59.4%
Republican
Herbert Hoover1928
79.4%
24,888 votes · R+59.3 · modeled estimate
Runner-up · Calvin Coolidge, 1924 · 78.9%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
82,867votes
56.8% of the vote · D+15.7 · modeled estimate
Runner-up · Kamala Harris, 2024 · 80,747 votes
Republican
Ronald Reagan1984
66,102votes
65.3% of the vote · R+31.3 · modeled estimate
Runner-up · Donald Trump, 2024 · 62,497 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
Kamala Harris2024
+14.0pts D vs U.S.
Place D+12.5 · U.S. R+1.5 · modeled estimate
Runner-up · Barack Obama, 2008 · +13.5 pts
Republican
Herbert Hoover1928
+41.8pts R vs U.S.
Place R+59.3 · U.S. R+17.5 · modeled estimate
Runner-up · William McKinley, 1896 · +39.2 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.
| Year | Vote lead | Democratic | Republican | Total |
|---|---|---|---|---|
| 2024 | D | 56.6%77,927 | 43.4%59,770 | 137,697 |
Its Democratic presidential margin was D+12.5 in 2024 and D+20.8 in 2008. About 265,000 residents lived here, with White alone at 73.9% in the 2024 ACS 5-year.
Across the recorded series it reached a Democratic high of 20.8 points in 2008 and a Republican high of 62.4 points in 1924. Between 2020 and 2024 the district moved 3.2 points toward the Republican candidate; the 2024 margin was 12.5 points.
A population of 263,361, a 70% non-Hispanic-white share, and a median household income of $69,787 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 28 and State Senate District 19.
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 →
Michigan 21st State Senate District. Akashic. https://akashic.app/sld-upper/26021/. Accessed May 20, 2026. License: CC BY 4.0.