Sioux City · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1892–2024 · 34 presidential cycles
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Franklin D. Roosevelt1932
65.7%
118,824 votes · D+32.9
Runner-up · Franklin D. Roosevelt, 1936 · 58.8%
Republican
Warren G. Harding1920
72.1%
99,073 votes · R+46.3
Runner-up · Donald Trump, 2024 · 71.9%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Franklin D. Roosevelt1932
118,824votes
65.7% of the vote · D+32.9
Runner-up · Franklin D. Roosevelt, 1936 · 114,961 votes
Republican
Donald Trump2024
141,399votes
71.9% of the vote · R+45.4
Runner-up · Donald Trump, 2020 · 140,017 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
Franklin D. Roosevelt1932
+15.2pts D vs U.S.
Place D+32.9 · U.S. D+17.8
Runner-up · Al Smith, 1928 · −0.2 pts
Republican
Donald Trump2020
+44.3pts R vs U.S.
Place R+39.8 · U.S. D+4.5
Runner-up · Donald Trump, 2024 · +44.0 pts
U.S. House elections · 3 House
Senate and governor results are in the Office selector at the top of this page.
U.S. House
On a multi-state Place, each row sums votes cast in the separate U.S. House races held inside the Place that year. It is a geographic vote total, not one contest or a seat tally.
Sioux City · how this place’s counties split between candidates in each party’s presidential nominating contest, cycle by cycle. A primary is a contest inside one party, so it has no Democratic–Republican margin and is not part of the general-election record above.
Akashic reports votes cast, not delegates awarded. The two can disagree: Clinton led the 2008 national primary popular vote by less than half a point and did not win the nomination.
Primary returns are published at county grain and there is no roll-up above it. Each cell counts how many of this place’s counties a candidate led — a count of records, not a vote total. Who led the place as a whole is not knowable from these returns, because county rows carry a leader and a lead but no per-candidate votes.
Presidential nominating contests in Sioux City, by party and cycle.
Party
2008
2012
2016
2020
2024
Democratic
Obama12Clinton10Edwards14,871 votes · 23 of 23 countiescaucus + primary
Sanders12Clinton1110,380 votes · 23 of 23 countiescaucus + primary
Biden15Buttigieg3Sanders3Klobuchar1Warren113,607 votes · 23 of 23 countiescaucus + primary
○no contest record
Republicannot ingested
○no contest record
○no contest record
○no contest record
○no contest record
○no contest record
○no contest record — Akashic holds no result for that party and cycle here. It is not a claim that no contest was held. Telling apart a contest that was cancelled, one that went uncontested, and one simply not yet ingested needs a nominating-contest calendar, which is a separate ingest from results and does not exist yet.
Republican presidential primaries are not yet ingested — the Republican series runs from 1856 and is in scope. The row is kept so its absence is visible: a Democratic-only panel would otherwise read as though no one else held a contest.
Akashic carries 10 states for 2012 and 3 states for 2024. Cycles in which an incumbent president seeks renomination are thin by nature — few states run a contested primary — so a sparse column is politics, not a hole in the record.
County returns carry a leader and a lead over the runner-up, and nothing more. The full candidate field with vote shares is published at state grain — follow a cycle above to the state contest for it.
voter registration
Registered voters
By party of registration, over time
Party registration · 2026R+40.9
vs
Presidential vote · 2024R+45.4
Registration leans Republican; the presidential vote runs 4.5 points more Republican than the rolls.
DemocraticRepublicanUnaffiliatedOther parties
† Some years predate full county coverage; a flagged year sums only the counties reporting it.
Voter registration in Sioux City
Year
Total registered
Democratic
Republican
Unaffiliated
Other
2008 (partial)
198,276
52,436
74,253
71,552
35
2010 (partial)
194,221
50,215
75,870
68,027
109
2012 (partial)
196,215
49,292
78,617
68,146
160
2014 (partial)
190,869
46,310
77,835
66,391
333
2016 (partial)
192,791
44,550
84,235
63,307
699
2018 (partial)
190,391
42,828
83,410
63,035
1,118
2020 (partial)
196,247
45,812
91,549
57,606
1,280
2022 (partial)
194,319
42,219
91,805
58,901
1,394
2024 (partial)
194,422
38,843
94,068
59,969
1,542
2026 (partial)
76,653
14,701
46,057
12,629
3,266
domestic migration
Who moves in and out
Net domestic migration over time
−1,763 net domestic migration · 2025
20112025
Net −29,720 over 2011–2025 · gain loss
Domestic migration in Sioux City in Sioux City: net domestic migration by year
Year
Net domestic migration
2011
−2,305
2012
−2,279
2013
−2,352
2014
−2,527
2015
−2,607
2016
−2,125
2017
−3,644
2018
−1,716
2019
−1,146
2021
−1,613
2022
−2,329
2023
−1,006
2024
−2,308
2025
−1,763
The Sioux City designated market area stretches across Iowa, Nebraska, South Dakota, and Minnesota, concentrating ad buys for campaigns targeting rural and small-city voters across a patchwork of closely contested congressional districts.
Across the recorded series it reached a Democratic high of 32.9 points in 1932 and a Republican high of 46.3 points in 1920. Between 2020 and 2024 the market moved 5.6 points toward the Republican candidate; the 2024 margin was 45.4 points.
A population of 418,200, a 77% non-Hispanic-white share, and a median household income of $73,438 describe the market. The market's voting pattern over the last decade is most similar to that of Lima and Minot-Bismarck-Dickinson (Williston).
Akashic
Political twins — media markets
The media markets 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.
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 →
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All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Sioux City, Iowa. Akashic. https://akashic.app/dma/624/. Accessed May 20, 2026. License: CC BY 4.0.
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In 2024, Sioux City, Iowa voted Republican by 45.4 points (R+45.4), carried by the Republican candidate. Out of 196,633 votes cast, 52,044 went Democratic and 141,399 went Republican.
When did Sioux City, Iowa last vote Democratic?
The most recent presidential election in which Sioux City, Iowa voted Democratic was 1964.
How many people live in Sioux City, Iowa?
Sioux City, Iowa has a population of 418,200 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Sioux City, Iowa?
Median household income in Sioux City, Iowa is $73,438 — below the national median of $80,734. The Iowa state median is $75,059.
What is the political history of Sioux City, Iowa?
Akashic tracks 34 presidential elections in Sioux City, Iowa from 1892 to 2024. Of those, 5 went Democratic and 28 went Republican.
