- Lead
- 36,457
- Total
- 85,032
- vs nation
- D+44.3
Arizona 20th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 46,684
- Total
- 92,318
- vs nation
- D+46.1
- Lead
- 36,237
- Total
- 73,896
- vs nation
- D+46.9
- Lead
- 30,245
- Total
- 64,924
- vs nation
- D+42.7
- Lead
- 30,715
- Total
- 66,701
- vs nation
- D+38.8
- Lead
- 28,581
- Total
- 62,147
- vs nation
- D+48.4
- Lead
- 22,104
- Total
- 49,906
- vs nation
- D+43.8
- Lead
- 21,989
- Total
- 46,649
- vs nation
- D+38.6
Key facts
- 2024 presidential margin
- D+42.9MIT Election Lab
- Population
- 238,4862024 5-year
- Population density
- 2,751 / sq mi2024 5-year · TIGER/Line
- Land area
- 86.7 sq miTIGER/Line
- Median household income
- $47,2492024 5-year
- White (non-Hispanic)
- 33.9%2024 5-year
- Black
- 3.3%2024 5-year
- Hispanic / Latino
- 53.4%2024 5-year
- Peak Democratic margin
- D+74.2 in 1936MIT Election Lab
- Most similar
- State Senate District 26, AZ · twin score 92.5
presidential history
Party record book
Arizona 20th State Senate District · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1912–2024 · 29 presidential cycles
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Franklin D. Roosevelt1936
86.7%
2,895 votes · D+74.2 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1932 · 84.7%
Republican
Dwight D. Eisenhower1956
41.4%
3,907 votes · D+17.2 · modeled estimate
Runner-up · Dwight D. Eisenhower, 1952 · 36.9%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
68,802votes
74.5% of the vote · D+50.6 · modeled estimate
Runner-up · Kamala Harris, 2024 · 59,799 votes
Republican
Donald Trump2024
23,342votes
27.5% of the vote · D+42.9 · modeled estimate
Runner-up · Donald Trump, 2020 · 22,118 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
James M. Cox1920
+70.6pts D vs U.S.
Place D+44.4 · U.S. R+26.2 · modeled estimate
Runner-up · Al Smith, 1928 · +61.3 pts
Republican
Barry Goldwater1964
−23.8pts R vs U.S.
Place D+46.4 · U.S. D+22.6 · modeled estimate
Runner-up · Ronald Reagan, 1980 · −29.5 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 |
|---|---|---|---|---|
| 2020 | D | 60.8%25,232 | 39.2%16,255 | 41,487 |
With a 2024 presidential margin of D+42.9, this Maricopa County district anchors the heavily Democratic core of the Phoenix metro, where dense, diverse urban precincts consistently produce some of the state's largest Democratic vote shares.
Across the recorded series it reached a Democratic high of 74.2 points in 1936. Between 2020 and 2024 the district moved 7.7 points toward the Republican candidate; the 2024 margin was 42.9 points.
A population of 238,486, a 34% non-Hispanic-white share, and a median household income of $47,249 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 26 and State Senate District 11.
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 →
Arizona 20th State Senate District. Akashic. https://akashic.app/sld-upper/04020/. Accessed May 20, 2026. License: CC BY 4.0.