- Lead
- 20,216
- Total
- 127,786
- vs nation
- D+17.3
Arizona 12th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 25,686
- Total
- 137,109
- vs nation
- D+14.3
- Lead
- 11,964
- Total
- 110,098
- vs nation
- D+8.8
- Lead
- 3,680
- Total
- 95,181
- vs nation
- Even
- Lead
- 3,895
- Total
- 94,249
- vs nation
- R+3.1
- Lead
- 276
- Total
- 81,658
- vs nation
- D+2.8
- Lead
- 2,551
- Total
- 62,420
- vs nation
- D+3.6
- Lead
- 6,160
- Total
- 57,320
- vs nation
- D+2.2
Key facts
- 2024 presidential margin
- D+15.8MIT Election Lab
- Population
- 238,9232024 5-year
- Population density
- 1,856 / sq mi2024 5-year · TIGER/Line
- Land area
- 129 sq miTIGER/Line
- Median household income
- $103,3982024 5-year
- White (non-Hispanic)
- 58.6%2024 5-year
- Black
- 6.2%2024 5-year
- Hispanic / Latino
- 19.6%2024 5-year
- Peak Democratic margin
- D+51.4 in 1936MIT Election Lab
- Peak Republican margin
- R+31.9 in 1984MIT Election Lab
- Most similar
- State Senate District 38, CA · twin score 86.2
presidential history
Party record book
Arizona 12th 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
73.1%
2,791 votes · D+51.4 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1932 · 71.4%
Republican
Ronald Reagan1984
65.2%
24,333 votes · R+31.9 · modeled estimate
Runner-up · Richard Nixon, 1972 · 61.9%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
80,152votes
58.5% of the vote · D+18.7 · modeled estimate
Runner-up · Kamala Harris, 2024 · 72,957 votes
Republican
Donald Trump2020
54,466votes
39.7% of the vote · D+18.7 · modeled estimate
Runner-up · Donald Trump, 2024 · 52,741 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
+42.5pts D vs U.S.
Place D+17.3 · U.S. R+25.2 · modeled estimate
Runner-up · James M. Cox, 1920 · +40.3 pts
Republican
Ronald Reagan1980
+18.6pts R vs U.S.
Place R+28.3 · U.S. R+9.7 · modeled estimate
Runner-up · Barry Goldwater, 1964 · +15.8 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
Arizona 12th State Senate District sits in the desert Southwest. In 2024 it voted Democratic.
Across the recorded series it reached a Democratic high of 51.4 points in 1936 and a Republican high of 31.9 points in 1984. Between 2020 and 2024 the district moved 2.9 points toward the Republican candidate; the 2024 margin was 15.8 points.
A population of 238,923, a 59% non-Hispanic-white share, and a median household income of $103,398 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 38 and State Senate District 13.
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 12th State Senate District. Akashic. https://akashic.app/sld-upper/04012/. Accessed May 20, 2026. License: CC BY 4.0.