- Lead
- 2,147
- Total
- 35,716
- vs nation
- D+7.5
Oklahoma 40th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 2,366
- Total
- 36,141
- vs nation
- D+2.1
- Lead
- 1,602
- Total
- 34,863
- vs nation
- R+6.7
- Lead
- 5,585
- Total
- 34,143
- vs nation
- R+20.2
- Lead
- 6,136
- Total
- 37,064
- vs nation
- R+23.8
- Lead
- 12,402
- Total
- 37,772
- vs nation
- R+30.4
- Lead
- 9,266
- Total
- 30,971
- vs nation
- R+30.4
- Lead
- 6,832
- Total
- 30,425
- vs nation
- R+31.0
Key facts
- 2024 presidential margin
- D+6.0MIT Election Lab
- Population
- 82,3022024 5-year
- Population density
- 2,858 / sq mi2024 5-year · TIGER/Line
- Land area
- 28.8 sq miTIGER/Line
- Median household income
- $69,9762024 5-year
- White (non-Hispanic)
- 59.7%2024 5-year
- Black
- 13.4%2024 5-year
- Hispanic / Latino
- 10.6%2024 5-year
- Peak Democratic margin
- D+31.2 in 1936MIT Election Lab
- Peak Republican margin
- R+56.1 in 1972MIT Election Lab
- Most similar
- State Senate District 39, OK · twin score 90.5
presidential history
Party record book
Oklahoma 40th State Senate District · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1908–2024 · 30 presidential cycles
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Franklin D. Roosevelt1936
65.3%
6,695 votes · D+31.2 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1932 · 63.9%
Republican
Richard Nixon1972
76.8%
22,435 votes · R+56.1 · modeled estimate
Runner-up · Ronald Reagan, 1984 · 73.3%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
18,773votes
51.9% of the vote · D+6.5 · modeled estimate
Runner-up · Kamala Harris, 2024 · 18,509 votes
Republican
George W. Bush2004
25,087votes
66.4% of the vote · R+32.8 · modeled estimate
Runner-up · Ronald Reagan, 1984 · 22,925 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
+30.2pts D vs U.S.
Place D+5.0 · U.S. R+25.2 · modeled estimate
Runner-up · James M. Cox, 1920 · +27.6 pts
Republican
Richard Nixon1972
+32.9pts R vs U.S.
Place R+56.1 · U.S. R+23.2 · modeled estimate
Runner-up · Ronald Reagan, 1980 · +32.2 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 |
|---|---|---|---|---|
| 2018 | D | 51.5%12,138 | 48.5%11,452 | 23,590 |
Oklahoma 40th State Senate District sits in the Southern Plains. In 2024 it voted Democratic.
Across the recorded series it reached a Democratic high of 31.2 points in 1936 and a Republican high of 56.1 points in 1972. Between 2020 and 2024 the district moved 0.5 points toward the Republican candidate; the 2024 margin was 6.0 points.
A population of 82,302, a 60% non-Hispanic-white share, and a median household income of $69,976 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 39 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 →
Oklahoma 40th State Senate District. Akashic. https://akashic.app/sld-upper/40040/. Accessed May 20, 2026. License: CC BY 4.0.