Sioux County, North Dakota: Black Belt county. In 2024, voted D+39%. Democratic peak: D+67 in 2008.
Key facts
- 2024 presidential margin
- D+39MIT Election Lab
- Political typology
- Black BeltAkashic typology
- Population
- 3,7402024 5-year
- Median household income
- $42,0832024 5-year
- White (non-Hispanic)
- 12.4%2024 5-year
- Black
- 0.4%2024 5-year
- Hispanic / Latino
- 1.5%2024 5-year
- Peak Democratic margin
- D+67 in 2008MIT Election Lab
- Peak Republican margin
- R+64 in 1920MIT Election Lab
- Most similar
- Menominee County, WI · similarity 0.99
2024 results by precinct
2024 precinct map of Sioux CountyPrecinct-level 2024 presidential results for Sioux County, with each precinct boundary colored by Democratic-vs-Republican margin.
—
Margin—
Turnout—
Harris +50Trump +50
Real precinct boundaries. Hover for vote totals.
presidential history
Presidential margin, 1876–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1876 | No data |
| 1880 | No data |
| 1884 | No data |
| 1888 | No data |
| 1892 | No data |
| 1896 | No data |
| 1900 | No data |
| 1904 | No data |
| 1908 | No data |
| 1912 | No data |
| 1916 | −6.9% |
| 1920 | −63.8% |
| 1924 | −57.6% |
| 1928 | +17.7% |
| 1932 | +56.8% |
| 1936 | +17.5% |
| 1940 | −33.7% |
| 1944 | −20.3% |
| 1948 | −17.3% |
| 1952 | −47.8% |
| 1956 | −20.2% |
| 1960 | +9.3% |
| 1964 | +37.6% |
| 1968 | +4.0% |
| 1972 | −0.4% |
| 1976 | +31.7% |
| 1980 | −21.7% |
| 1984 | +19.1% |
| 1988 | +36.1% |
| 1992 | +20.2% |
| 1996 | +27.0% |
| 2000 | +43.7% |
| 2004 | +42.5% |
| 2008 | +67.5% |
| 2012 | +59.0% |
| 2016 | +40.4% |
| 2020 | +46.0% |
| 2024 | +38.7% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| D | 654 | 285 | 953 | ||
| D | 804 | 258 | 1,186 | ||
| D | 758 | 260 | 1,232 | ||
| D | 900 | 225 | 1,144 | ||
| D | 1,145 | 215 | 1,378 | ||
| D | 804 | 319 | 1,140 | ||
| D | 724 | 269 | 1,041 | ||
| D | 393 | 207 | 690 | ||
| D | 463 | 264 | 984 | ||
| D | 701 | 325 | 1,042 | ||
| D | 655 | 442 | 1,118 | ||
| R | 383 | 620 | 1,090 | ||
| D | 697 | 354 | 1,081 | ||
| R | 557 | 561 | 1,142 | ||
| D | 525 | 482 | 1,065 | ||
| D | 695 | 314 | 1,013 | ||
| D | 688 | 571 | 1,259 | ||
| R | 476 | 718 | 1,197 | ||
| R | 336 | 968 | 1,322 | ||
| R | 465 | 667 | 1,166 | ||
| R | 445 | 673 | 1,122 | ||
| R | 578 | 1,167 | 1,746 | ||
| D | 877 | 585 | 1,664 | ||
| D | 1,328 | 350 | 1,722 | ||
| D | 988 | 687 | 1,698 | ||
| R | 58 | 777 | 1,249 | ||
| R | 163 | 776 | 961 | ||
| R | 200 | 232 | 463 | ||
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Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
9.1%
French
1.3%
Irish
0.9%
English
0.8%
Polish
0.6%
Sample size too small to break out by ancestry reliably.
Multiple ancestry combinations reported; no single grouping above 1%.
Sample size too small to break out by ancestry reliably.
American Indian, Alaska Native, Native Hawaiian, and Pacific Islander combined.
Source · American Community Survey 5-year estimates, 2024 release. Hispanic/Latino is an ethnicity that overlaps the race categories, so these shares can total more than 100%. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
2024 ACS
Age distribution by sex
Median age: 28.2 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Median household income
Inflation-adjusted dollars
$42,083
Sioux County ranks in the bottom 10% of US counties.
Sioux County$42,083
North Dakota$76,657
United States$80,734
Sioux County ranks in the bottom 10% of US counties by median household income.
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Poverty rate
All persons below federal poverty line
43.3%
Nearly half of children live in poverty.
Children under 1857.2%
Working age (18–64)36.2%
Seniors (65+)31.3%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
92.2%
speak English only
Other languages6.5%
Asian & Pacific Islander0.7%
Spanish0.4%
Other Indo-European0.2%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 61.3% of residents not counted as adherents by any reporting body.
Sioux County encompasses most of the Standing Rock Sioux Reservation, producing among the widest Democratic presidential margins in the state — 38.7 points in 2024 — driven by a Native American majority electorate.
The Democratic margin here reached sixty-seven points in 2008. Between 2020 and 2024 the county moved seven points toward the Republican candidate; the 2024 margin was thirty-nine points. The recent movement, modest against a deep Democratic baseline, mirrors a broader rightward drift across the Black Belt.
The economic context is part of the story: a median household income of $42,083 and a 43% poverty rate. The county's voting pattern over the last decade is most similar to that of Menominee County and Taos County.
Most similar counties
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.
Sioux County, North Dakota. Akashic. https://akashic.app/county/38085/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
More in North Dakota
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Frequently asked questions
How did Sioux County, North Dakota vote in 2024?
In 2024, Sioux County, North Dakota voted Democratic by 38.7 points (D+39), carried by the Democratic candidate. Out of 953 votes cast, 654 went Democratic and 285 went Republican.
What is Sioux County, North Dakota's political typology?
Akashic places Sioux County, North Dakota in the "Black Belt" typology — Black-majority counties of the rural South — long the most Democratic ground in the region, now trending Republican at the margins. The typology is a data-driven cluster built from vote share, vote swing, race and ethnicity, income, language spoken at home, religion, and ancestry. Across 38 elections in the dataset, the county has voted Democratic 18 times, Republican 10 times, and other 0 times.
When did Sioux County, North Dakota last vote Republican?
The most recent presidential election in which Sioux County, North Dakota voted Republican was 1980.
How many people live in Sioux County, North Dakota?
Sioux County, North Dakota has a population of 3,740 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Sioux County, North Dakota?
Median household income in Sioux County, North Dakota is $42,083 — below the national median of $80,734. The North Dakota state median is $76,657.
What is the political history of Sioux County, North Dakota?
Akashic tracks 38 presidential elections in Sioux County, North Dakota from 1876 to 2024. Of those, 18 went Democratic and 10 went Republican. The county's typology — "Black Belt" — captures where that record, its demographics, and its recent swing place it among American communities.