- Lead
- 84,759
- Total
- 213,807
- vs nation
- D+41.1
Arizona 3rd Congressional District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 116,163
- Total
- 229,441
- vs nation
- D+46.2
- Lead
- 84,632
- Total
- 169,406
- vs nation
- D+47.9
- Lead
- 67,235
- Total
- 142,948
- vs nation
- D+43.2
- Lead
- 67,273
- Total
- 142,199
- vs nation
- D+40.0
- Lead
- 53,293
- Total
- 121,391
- vs nation
- D+46.4
- Lead
- 42,862
- Total
- 93,304
- vs nation
- D+45.4
- Lead
- 44,268
- Total
- 89,466
- vs nation
- D+41.0
Key facts
- 2024 presidential margin
- D+39.6MIT Election Lab
- Population
- 794,6122024 5-year
- Population density
- 3,859 / sq mi2024 5-year · TIGER/Line
- Land area
- 206 sq miTIGER/Line
- Median household income
- $68,2022024 5-year
- White (non-Hispanic)
- 19.6%2024 5-year
- Black
- 10.1%2024 5-year
- Hispanic / Latino
- 62.6%2024 5-year
- Peak Democratic margin
- D+89.2 in 1936MIT Election Lab
- Most similar
- Congressional District 7, AZ · twin score 94.9
presidential history
Party record book
Arizona 3rd Congressional 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. Roosevelt1932
94.2%
5,264 votes · D+88.9 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1936 · 93.5%
Republican
Ronald Reagan1984
43.1%
20,535 votes · D+12.9 · modeled estimate
Runner-up · Richard Nixon, 1972 · 40.8%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
170,886votes
74.5% of the vote · D+50.6 · modeled estimate
Runner-up · Kamala Harris, 2024 · 147,521 votes
Republican
Donald Trump2024
62,762votes
29.4% of the vote · D+39.6 · modeled estimate
Runner-up · Donald Trump, 2020 · 54,723 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
+102.5pts D vs U.S.
Place D+76.4 · U.S. R+26.2 · modeled estimate
Runner-up · John W. Davis, 1924 · +94.0 pts
Republican
Ronald Reagan1980
−23.2pts R vs U.S.
Place D+13.4 · U.S. R+9.7 · modeled estimate
Runner-up · Barry Goldwater, 1964 · −27.9 pts
Current officeholders
Federal officeholders only. State and local officeholders are planned for the next data pass.
Senate and governor results are in the Office selector at the top of this page.
U.S. House
Each result reflects the U.S. House district as it was drawn for that election; redistricting has redrawn these lines over time, so they can differ from the current 120th-Congress district shown on the map above.
Arizona's 3rd anchors in west Phoenix and its inner suburbs, where a heavily Latino electorate has delivered Democratic presidential margins exceeding 14 points, making it one of the more reliably left-leaning seats in the state's congressional map.
Across the recorded series it reached a Democratic high of 89.2 points in 1936. Between 2020 and 2024 the district moved 11.0 points toward the Republican candidate; the 2024 margin was 39.6 points.
A population of 794,612, a 20% non-Hispanic-white share, and a median household income of $68,202 describe the district. The district's voting pattern over the last decade is most similar to that of Congressional District 7 and Congressional District 29.
The congressional 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 3rd Congressional District. Akashic. https://akashic.app/cd/0403/. Accessed May 20, 2026. License: CC BY 4.0.