Jefferson County, Iowa
Latest: 2024
Leans Republican — shifted 5.4pp toward Republicans in 2024 — 40 presidential elections on record
Race & ancestry
| Group | % |
|---|---|
▶White (Non-Hispanic)(13) | 82.4% |
▶Hispanic / Latino(5) | 4.1% |
▶Black / African American(5) | 2.5% |
▶Asian(4) | 8.2% |
▶Middle Eastern / North African(4) | 1.6% |
▶Native American / Alaska Native(1) | 0.8% |
Multiracial / Other | 2.0% |
Religious adherence
| Tradition | % Pop | % Adherents |
|---|---|---|
| Mainline Protestant | 11.6% | 38.6% |
| Catholic | 6.4% | 21.5% |
| Other | 6.0% | 20.1% |
| Evangelical Protestant | 5.9% | 19.8% |
| LDS (Mormon) | 2.1% | 7.1% |
| Non-religious | 70.0% | — |
Presidential results
| Year | Result |
|---|---|
| 2024 | Trump+6.8 |
| 2020 | Trump+1.4 |
| 2016 | Trump+0.5 |
| 2012 | Obama+16.0 |
| 2008 | Obama+20.2 |
| 2004 | Kerry+10.2 |
| 2000 | Bush+5.1 |
| 1996 | Clinton+0.8 |
| 1992 | Clinton+0.3 |
Jefferson, Iowa is a county that has a population of 15,705. In the 2024 presidential election, it voted Republican with a margin of R+6.8. Akashic Edge tracks 40 presidential elections here, dating back to 1868.
| Year | Dem % | Rep % | Margin | Swing |
|---|---|---|---|---|
| 2024 | 45.4% | 52.2% | R+6.8 | R+5.4 |
| 2020 | 48.2% | 49.6% | R+1.4 | R+0.9 |
| 2016 | 44.8% | 45.2% | R+0.5 | R+16.4 |
| 2012 | 56.2% | 40.3% | D+16.0 | R+4.3 |
| 2008 | 58.7% | 38.5% | D+20.2 | D+10.1 |
| 2004 | 54.2% | 44.1% | D+10.2 | D+15.3 |
| 2000 | 37.9% | 43.0% | R+5.1 | R+5.9 |
| 1996 | 35.1% | 34.4% | D+0.8 | D+0.5 |
| 1992 | 30.7% | 30.5% | D+0.3 | D+0.5 |
| 1988 | 49.3% | 49.5% | R+0.3 | D+22.6 |
| 1984 | 38.3% | 61.2% | R+22.9 | R+2.0 |
| 1980 | 35.3% | 56.2% | R+20.9 | R+15.8 |
| 1976 | 46.6% | 51.7% | R+5.1 | D+26.6 |
| 1972 | 33.1% | 64.8% | R+31.7 | R+7.0 |
| 1968 | 34.7% | 59.5% | R+24.8 | R+44.7 |
| 1964 | 59.8% | 39.8% | D+19.9 | D+48.0 |
| 1960 | 36.0% | 64.0% | R+28.0 | R+2.4 |
| 1956 | 37.1% | 62.8% | R+25.6 | D+13.2 |
| 1952 | 30.3% | 69.1% | R+38.8 | R+26.5 |
| 1948 | 42.8% | 55.1% | R+12.3 | — |
What defines Jefferson?
Jefferson has been trending Republican — 23pp redder over the last 4 presidential cycles. It has a highly educated electorate (43% college-educated) — a demographic increasingly aligned with Democrats nationwide.
County in State Context
Current Iowa Polling
Contextual statewide polling for Iowa. County pages stay rooted in county returns, but live statewide polling helps frame the current cycle.
2026 Iowa Governor General Election
Rob Sand leads at 50.0%
1 pollsSparse
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Explore this county's political evolution with the Historian
Key Insights
High-confidence patterns distilled from this geography's election history.
- The 2016 election was decided by just 0.5 points — razor-thin
- Won by both parties in recent history — Democrats most recently in 2012, Republicans in 2024
- Shifted 22.7 points toward Republicans over the last 4 elections
Located In
Jefferson sits inside these higher-level geographies.