Union, Iowa — Presidential Election Results
Union, Iowa has voted Republican in 5 of the last 7 presidential elections on record (2000–2024). It most recently flipped to Republican in 2016. In 2024, it was 23.2 pts more Rep. than Iowa overall.
Jump to year: 2000 · 2004 · 2008 · 2012 · 2016 · 2020 · 2024
Full Election History, 2000–2024
| Year | Winner | Party | Votes | Vote Share | Margin | Total Votes Cast | Swing | Vs. Iowa |
|---|---|---|---|---|---|---|---|---|
| 2000 | George W. Bush | Republican | 3,003 | 52.3% | 8.1 pts (463 votes) | 5,740 | — | 8.7 pts more Rep. |
| 2004 | George W. Bush | Republican | 3,165 | 52.9% | 7.0 pts (418 votes) | 5,978 | +1.3 pts | 6.4 pts more Rep. |
| 2008 | Barack Obama | Democratic | 3,000 | 50.8% | 3.7 pts (219 votes) | 5,909 | +10.9 pts | 5.9 pts more Rep. |
| 2012 | Barack Obama | Democratic | 3,043 | 51.1% | 3.9 pts (230 votes) | 5,957 | +0.1 pts | 2.0 pts more Rep. |
| 2016 | Donald Trump | Republican | 3,525 | 60.4% | 27.5 pts (1,603 votes) | 5,832 | -33.4 pts | 19.3 pts more Rep. |
| 2020 | Donald J Trump | Republican | 4,024 | 65.1% | 31.7 pts (1,963 votes) | 6,185 | -2.8 pts | 23.7 pts more Rep. |
| 2024 | Donald J Trump | Republican | 4,044 | 67.3% | 36.1 pts (2,170 votes) | 6,013 | -4.4 pts | 23.2 pts more Rep. |
Population Context
Total Census Bureau population estimate for the county that year, and recorded votes as a share of that total population. This is a population-based figure, not a turnout rate against eligible or registered voters, which this site does not calculate.
| Year | County Population | Votes Cast (% of Population) |
|---|---|---|
| 2000 | 12,281 | 46.7% of population |
| 2004 | 12,085 | 49.5% of population |
| 2008 | 12,447 | 47.5% of population |
| 2012 | 12,586 | 47.3% of population |
| 2016 | 12,360 | 47.2% of population |
| 2020 | 12,128 | 51.0% of population |
| 2024 | 11,955 | 50.3% of population |
Trend
Between 2000 and 2024, the two-party presidential margin in Union shifted 28.3 points toward the Republican candidate, based on recorded county returns. This reflects the vote totals in this dataset only; no claim is made here about the causes of that shift.
Margin Over Time
Democratic candidate's margin (percentage points, two-party vote share). Positive values favor the Democratic candidate; negative values favor the Republican candidate.
Bellwether Status
Union has matched the national popular winner in 6 of the last 7 presidential elections (86%), and Iowa's own statewide winner in 6 of 7 (86%). Compare every county on the bellwether counties page.
Related Pages
Other Iowa Counties
Frequently Asked Questions
How has Union voted in presidential elections since 2000?
Since 2000, Union has voted Democratic in 2 of 7 recorded presidential elections and Republican in 5 of 7, based on county-level returns through 2024.
What was the closest presidential election in Union?
Union's closest recorded margin was in 2008, when Barack Obama (Democratic) won by 3.8 points (219 votes) out of 5,909 total votes cast.
Has Union ever flipped between parties?
Yes. Union changed which party won the county in: 2008, 2016, based on the 2000-2024 record on this page.
What is the largest presidential election margin recorded in Union?
The widest margin on record for Union was in 2024, when Donald J Trump (Republican) won by 36.7 points.
How many votes were cast in Union relative to its population?
In 2024, 6,013 votes were recorded in Union against a total population of 11,955 (50.3% of the total population). This is a population-based figure, not a turnout rate against eligible or registered voters, which this site does not calculate.
Is Union a presidential bellwether county?
Union has matched the national popular winner in 6 of the last 7 presidential elections (86%), and Iowa's own statewide winner in 6 of 7 (86%).