Sioux County, Iowa
Precinct data
Results by precinct
17 precincts · 18,881 votes
Precinct boundaries and identifiers are cycle-specific. This table does not join rows across years without a validated crosswalk.
| Precinct -Sioux Center 4Sioux Center 4 | 239 | 1,571 | 16 | 1,826 | 13.1% | 86.0% | R+72.9 |
|---|---|---|---|---|---|---|---|
| Precinct -Orange City 2 Holland SEOrange City 2 Holland SE | 300 | 1,437 | 27 | 1,764 | 17.0% | 81.5% | R+64.5 |
| Precinct -Orange City 1 Holland SWOrange City 1 Holland SW | 332 | 1,371 | 35 | 1,738 | 19.1% | 78.9% | R+59.8 |
| Precinct -Hull LincolnHull Lincoln | 126 | 1,553 | 11 | 1,690 | 7.5% | 91.9% | R+84.4 |
| Precinct -Hawarden BC EGW GF LG WAWHawarden BC EGW GF LG WAW | 362 | 1,051 | 16 | 1,429 | 25.3% | 73.5% | R+48.2 |
| Precinct -Capel Grant Lynn SheridanCapel Grant Lynn Sheridan | 120 | 1,220 | 18 | 1,358 | 8.8% | 89.8% | R+81.0 |
| Precinct -Rock Valley 2Rock Valley 2 | 126 | 949 | 9 | 1,084 | 11.6% | 87.5% | R+75.9 |
| Precinct -Sioux Center 3Sioux Center 3 | 168 | 901 | 14 | 1,083 | 15.5% | 83.2% | R+67.7 |
| Precinct -East Orange Floyd Holland N1/2East Orange Floyd Holland N1/2 | 128 | 919 | 14 | 1,061 | 12.1% | 86.6% | R+74.6 |
| Precinct -Rock Valley 1Rock Valley 1 | 88 | 844 | 2 | 934 | 9.4% | 90.4% | R+80.9 |
| Precinct -Alton NassauAlton Nassau | 164 | 754 | 8 | 926 | 17.7% | 81.4% | R+63.7 |
| Precinct -Plato Rock Settlers SiouxPlato Rock Settlers Sioux | 43 | 864 | 2 | 909 | 4.7% | 95.0% | R+90.3 |
| Precinct -Ireton CR EGE RD WAEIreton CR EGE RD WAE | 80 | 739 | 4 | 823 | 9.7% | 89.8% | R+80.1 |
| Precinct -Sioux Center 1 WCSioux Center 1 WC | 82 | 678 | 7 | 767 | 10.7% | 88.4% | R+77.7 |
| Precinct -Sioux Center 2Sioux Center 2 | 202 | 531 | 10 | 743 | 27.2% | 71.5% | R+44.3 |
| Precinct -West BranchWest Branch | 44 | 347 | 7 | 398 | 11.1% | 87.2% | R+76.1 |
| Precinct -Maurice ShermanMaurice Sherman | 22 | 324 | 2 | 348 | 6.3% | 93.1% | R+86.8 |
Presidential margin, 1892–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1892 | −5.8% |
| 1896 | −19.6% |
| 1900 | −24.8% |
| 1904 | −43.6% |
| 1908 | −17.4% |
| 1912 | +18.8% |
| 1916 | −4.9% |
| 1920 | −59.6% |
| 1924 | −48.2% |
| 1928 | −38.3% |
| 1932 | +21.8% |
| 1936 | +9.5% |
| 1940 | −29.3% |
| 1944 | −32.0% |
| 1948 | −15.9% |
| 1952 | −66.6% |
| 1956 | −56.7% |
| 1960 | −59.1% |
| 1964 | −31.2% |
| 1968 | −62.6% |
| 1972 | −57.3% |
| 1976 | −47.4% |
| 1980 | −57.0% |
| 1984 | −63.5% |
| 1988 | −55.3% |
| 1992 | −57.1% |
| 1996 | −60.0% |
| 2000 | −68.7% |
| 2004 | −72.2% |
| 2008 | −62.8% |
| 2012 | −67.6% |
| 2016 | −68.1% |
| 2020 | −66.5% |
| 2024 | −70.7% |
U.S. Senate
| Year | Won | Democratic | Republican | Total |
|---|---|---|---|---|
| 2022 | R | 12.0%1,694 | 88.0%12,398 | 14,092 |
| 2020 | R | 15.0%2,828 | 83.6%15,785 | 18,886 |
Registered voters
By party of registration, over time
Registration leans Republican; the presidential vote runs 8.6 points more Democratic.
| Year | Total registered | Democratic | Republican | Unaffiliated | Other |
|---|---|---|---|---|---|
| 2008 | 21,098 | 1,990 | 14,992 | 4,113 | 3 |
| 2010 | 20,010 | 1,787 | 14,613 | 3,605 | 5 |
| 2012 | 20,670 | 1,757 | 14,909 | 3,992 | 12 |
| 2014 | 21,179 | 1,769 | 14,988 | 4,399 | 23 |
| 2016 | 21,848 | 1,831 | 15,758 | 4,200 | 59 |
| 2018 | 22,246 | 1,893 | 15,859 | 4,414 | 80 |
| 2020 | 23,049 | 2,245 | 16,556 | 4,145 | 103 |
| 2022 | 23,350 | 2,124 | 16,617 | 4,503 | 106 |
| 2024 | 23,760 | 1,995 | 16,740 | 4,907 | 118 |
Who moves in and out
Net migration over time, and who arrivals are — where they came from and what those places vote
−225 net domestic migration · 2025
Net −2,536 over 2011–2025 · gain loss
Arrivals reported $66,872 in average income, against $104,413 for residents who stayed — 36% lower. (IRS SOI, 2022–23)
The places arrivals came from lean R+48.7 on average — 22 points more Democratic-leaning than Sioux County, IA itself (R+70.7).
Where arrivals came from lean of each source
- Lyon County, IA51R+69.6
- O'Brien County, IA45R+60.7
- Plymouth County, IA45R+54.1
- Minnehaha County, SD32R+12.7
- Woodbury County, IA27R+22.9
Where departures went households, 2022–23
- O'Brien County, IA61
- Plymouth County, IA46
- Minnehaha County, SD43
- Lincoln County, SD39
- Lyon County, IA37
- Dickinson County, IA21
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 | −73 |
| 2012 | −25 |
| 2013 | −115 |
| 2014 | −211 |
| 2015 | −205 |
| 2016 | −96 |
| 2017 | −440 |
| 2018 | −262 |
| 2019 | −205 |
| 2021 | −133 |
| 2022 | −172 |
| 2023 | −195 |
| 2024 | −179 |
| 2025 | −225 |
Sioux County's 2024 presidential margin of R+70.7 ranks among the widest in Iowa, reflecting a densely Reformed Dutch Protestant community in the northwest corner of the state where cultural homogeneity translates into unusually consistent electoral outcomes.
Across the recorded series it reached a Democratic high of 21.8 points in 1932 and a Republican high of 72.2 points in 2004. Between 2020 and 2024 the county moved 4.2 points toward the Republican candidate; the 2024 margin was 70.7 points.
A population of 36,212, a 83% non-Hispanic-white share, and a median household income of $86,098 describe the county. The county's voting pattern over the last decade is most similar to that of Gray County and Lyon County.
The counties 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.
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 →
Sioux County, Iowa. Akashic. https://akashic.app/county/19167/. Accessed May 20, 2026. License: CC BY 4.0.