HarrisDemocratic55.2%1,032TrumpRepublican42.4%793KennedyIndependent2.3%43
D+12.8- Lead
- 239
- Total
- 1,871
- vs nation
- D+14.2
- Turnout
- 59.9%
Akashiccounty
Dewey County, SD
Office (updates table and map)
President margin by year
Place winner margin
Boundary by 2024 margin · Precinct returns · VEST · MIT Election Lab
The precinct map shows the 2024 presidential vote; the timeline scrubs the county’s overall result across 1912–2024.
President results by year
2024 turnout 59.9% of 3,190 citizens 18+
BidenDemocratic57.5%1,131TrumpRepublican40.2%790JorgensenLibertarian2.3%45
D+17.3- Lead
- 341
- Total
- 1,966
- vs nation
- D+12.9
- Turnout
- 54.6%
ClintonDemocratic52.0%888TrumpRepublican42.3%723JohnsonLibertarian4.2%71
D+9.7- Lead
- 165
- Total
- 1,708
- vs nation
- D+7.6
- Turnout
- 47.4%
ObamaDemocratic63.7%1,207RomneyRepublican35.0%663OtherAll other candidates1.3%25
D+28.7- Lead
- 544
- Total
- 1,895
- vs nation
- D+24.9
- Turnout
- —
ObamaDemocratic65.8%1,328McCainRepublican32.6%659OtherAll other candidates1.6%32
D+33.1- Lead
- 669
- Total
- 2,019
- vs nation
- D+25.9
- Turnout
- —
KerryDemocratic62.6%1,606BushRepublican35.9%921OtherAll other candidates1.4%37
D+26.7- Lead
- 685
- Total
- 2,564
- vs nation
- D+29.2
- Turnout
- —
GoreDemocratic52.3%880BushRepublican45.3%761OtherAll other candidates2.4%40
D+7.1- Lead
- 119
- Total
- 1,681
- vs nation
- D+6.6
- Turnout
- —
ClintonDemocratic56.3%1,114DoleRepublican33.2%657PerotReform9.9%195
D+23.1- Lead
- 457
- Total
- 1,979
- vs nation
- D+14.6
- Turnout
- —
Key facts
- 2024 presidential margin
- D+12.8MIT Election Lab
- Population
- 5,2052024 5-year
- Population density
- 2.3 / sq mi2024 5-year · TIGER/Line
- Land area
- 2,302 sq miTIGER/Line
- Median household income
- $54,1042024 5-year
- White (non-Hispanic)
- 21.0%2024 5-year
- Black
- 0.5%2024 5-year
- Hispanic / Latino
- 1.0%2024 5-year
- Peak Democratic margin
- D+42.2 in 1912MIT Election Lab
- Peak Republican margin
- R+40.7 in 1924MIT Election Lab
- Most similar
- Corson County, SD · twin score 95.5
Midterm durability
Total general-election participants divided by same-year citizen voting-age population. These are total ballots or participating voters—not presidential candidate votes.
- 2024 total turnout
- 59.9%1,912 participants ÷ 3,190 CVAP
- 2020→2022 drop-off
- +4.6 ptsMidterm-resilient, low base
- Drop-off versus state
- -7.7 ptsPositive means a larger decline than the statewide pattern
- Mechanical 2026 scenario
- 55.4%–59.2%Recent-cycle and two-cycle persistence scenarios; not a forecast
| Election | Participants | CVAP | Turnout | Quality |
|---|---|---|---|---|
| 2016 · Presidential | 1,734 | 3,658 | 47.4% | A/A |
| 2018 · Midterm | 1,851 | 3,668 | 50.5% | A/A |
| 2020 · Presidential | 1,982 | 3,630 | 54.6% | A/A |
| 2022 · Midterm | 1,630 | 3,258 | 50.0% | C/A |
| 2024 · Presidential | 1,912 | 3,190 | 59.9% | A/A |
Sources and methods
- 2016: numerator source 158, denominator source 157; total voters participating; eavs-f1a-v1:observed:native; allocation share 0.0%; series 293/111.
- 2018: numerator source 158, denominator source 157; total voters participating; eavs-f1a-v1:observed:native; allocation share 0.0%; series 297/138.
- 2020: numerator source 158, denominator source 157; total voters participating; eavs-f1a-v1:observed:native; allocation share 0.0%; series 301/2.
- 2022: numerator source 159, denominator source 157; top ticket votes; canonical-complete-contest-floor-v1; allocation share 0.0%; series 154/183.
- 2024: numerator source 158, denominator source 157; total voters participating; eavs-f1a-v1:observed:native; allocation share 0.0%; series 311/228.
presidential history
Party record book
Dewey County, SD · 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
68.6%
1,608 votes · D+38.3
Runner-up · Barack Obama, 2008 · 65.8%
Republican
Dwight D. Eisenhower1952
66.3%
1,307 votes · R+32.6
Runner-up · Thomas E. Dewey, 1944 · 63.9%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Franklin D. Roosevelt1932
1,608votes
68.6% of the vote · D+38.3
Runner-up · John Kerry, 2004 · 1,606 votes
Republican
Wendell Willkie1940
1,396votes
56.4% of the vote · R+12.7
Runner-up · Dwight D. Eisenhower, 1952 · 1,307 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 Kerry2004
+29.2pts D vs U.S.
Place D+26.7 · U.S. R+2.5
Runner-up · Barack Obama, 2008 · +25.9 pts
Republican
Thomas E. Dewey1944
+35.4pts R vs U.S.
Place R+27.9 · U.S. D+7.5
Runner-up · Wendell Willkie, 1940 · +22.7 pts
voter registration
Registered voters
By party of registration, over time
Party registration · 2026D+27.0
Presidential vote · 2024D+12.8
Registration leans Democratic; the presidential vote runs 14 points more Republican than the rolls.
3,444 registered voters · 2026
domestic migration
Who moves in and out
Net migration over time, and who arrivals are — where they came from and what those places vote
−27 net domestic migration · 2025
20112025
Net −351 over 2011–2025 · gain loss
Arrivals reported $39,241 in average income, against $59,133 for residents who stayed — 34% lower. (IRS SOI, 2022–23)
Migration is one input to a place’s political change, not its cause — a shift can also come from residents changing their minds, generational turnover, or turnout. These figures describe the places people moved between; they do not measure how any mover voted.
| Year | Net domestic migration |
|---|---|
| 2011 | +9 |
| 2012 | +32 |
| 2013 | −4 |
| 2014 | −15 |
| 2015 | −46 |
| 2016 | −15 |
| 2017 | −18 |
| 2018 | −30 |
| 2019 | −99 |
| 2021 | −23 |
| 2022 | −101 |
| 2023 | +58 |
| 2024 | −72 |
| 2025 | −27 |
Dewey County's electorate is shaped by the Cheyenne River Sioux Reservation, which covers much of its land area and drives Democratic margins that stand out sharply in an otherwise deeply Republican state.
Across the recorded series it reached a Democratic high of 42.2 points in 1912 and a Republican high of 40.7 points in 1924. Between 2020 and 2024 the county moved 4.6 points toward the Republican candidate; the 2024 margin was 12.8 points.
A population of 5,205, a 21% non-Hispanic-white share, and a median household income of $54,104 describe the county. The county's voting pattern over the last decade is most similar to that of Corson County and Todd County.
Political twins — counties
The counties whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Corson County
South Dakota
95.5twin score
2004–2008 trajectorymedian age% White
Todd County
South Dakota
94.6twin score
2004–2008 trajectorymedian age% White≠ 2016 margin
Buffalo County
South Dakota
93.4twin score
2004–2012 trajectory% White≠ % Catholic
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.
Browse places by community — income, education, race & ethnicity, language — all community cuts →
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Dewey County, South Dakota. Akashic. https://akashic.app/county/46041/. Accessed May 20, 2026. License: CC BY 4.0.
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Frequently asked questions
How did Dewey County, South Dakota vote in 2024?
In 2024, Dewey County, South Dakota voted Democratic by 12.8 points (D+12.8), carried by the Democratic candidate. Out of 1,871 votes cast, 1,032 went Democratic and 793 went Republican.
When did Dewey County, South Dakota last vote Republican?
The most recent presidential election in which Dewey County, South Dakota voted Republican was 1984.
How many people live in Dewey County, South Dakota?
Dewey County, South Dakota has a population of 5,205 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Dewey County, South Dakota?
Median household income in Dewey County, South Dakota is $54,104 — below the national median of $80,734. The South Dakota state median is $75,081.
What is the political history of Dewey County, South Dakota?
Akashic tracks 38 presidential elections in Dewey County, South Dakota from 1876 to 2024. Of those, 14 went Democratic and 14 went Republican.