Louisa County, Iowa
Precinct data
Results by precinct
5 precincts · 5,136 votes
Precinct boundaries and identifiers are cycle-specific. This table does not join rows across years without a validated crosswalk.
| Precinct -Southeast LouisaSoutheast Louisa | 423 | 1,133 | 24 | 1,580 | 26.8% | 71.7% | R+44.9 |
|---|---|---|---|---|---|---|---|
| Precinct -West LouisaWest Louisa | 343 | 819 | 12 | 1,174 | 29.2% | 69.8% | R+40.5 |
| Precinct -Grandview Port LouisaGrandview Port Louisa | 293 | 771 | 11 | 1,075 | 27.3% | 71.7% | R+44.5 |
| Precinct -Morningsun MarshallMorningsun Marshall | 155 | 551 | 14 | 720 | 21.5% | 76.5% | R+55.0 |
| Precinct -Columbus Jct CityColumbus Jct City | 266 | 310 | 11 | 587 | 45.3% | 52.8% | R+7.5 |
Presidential margin, 1892–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1892 | −24.1% |
| 1896 | −20.4% |
| 1900 | −29.3% |
| 1904 | −50.2% |
| 1908 | −34.1% |
| 1912 | −6.4% |
| 1916 | −26.4% |
| 1920 | −57.2% |
| 1924 | −50.8% |
| 1928 | −38.2% |
| 1932 | +16.3% |
| 1936 | +3.6% |
| 1940 | −19.2% |
| 1944 | −18.2% |
| 1948 | −10.7% |
| 1952 | −37.3% |
| 1956 | −26.3% |
| 1960 | −21.4% |
| 1964 | +17.4% |
| 1968 | −20.0% |
| 1972 | −24.0% |
| 1976 | −4.4% |
| 1980 | −18.1% |
| 1984 | −15.2% |
| 1988 | +4.7% |
| 1992 | +8.3% |
| 1996 | +12.1% |
| 2000 | +1.9% |
| 2004 | −5.6% |
| 2008 | +4.2% |
| 2012 | +0.6% |
| 2016 | −28.0% |
| 2020 | −33.3% |
| 2024 | −40.9% |
U.S. Senate
| Year | Won | Democratic | Republican | Total |
|---|---|---|---|---|
| 2022 | R | 29.8%1,038 | 70.2%2,441 | 3,479 |
| 2020 | R | 34.3%1,804 | 62.0%3,259 | 5,255 |
Registered voters
By party of registration, over time
Registration leans Republican; the presidential vote runs 21 points more Democratic.
| Year | Total registered | Democratic | Republican | Unaffiliated | Other |
|---|---|---|---|---|---|
| 2008 | 7,685 | 2,329 | 2,454 | 2,902 | 0 |
| 2010 | 7,478 | 2,070 | 2,612 | 2,794 | 2 |
| 2012 | 7,523 | 2,045 | 2,581 | 2,895 | 2 |
| 2014 | 7,410 | 1,930 | 2,515 | 2,955 | 10 |
| 2016 | 7,483 | 1,859 | 2,651 | 2,953 | 20 |
| 2018 | 7,200 | 1,770 | 2,496 | 2,903 | 31 |
| 2020 | 7,335 | 1,839 | 2,867 | 2,590 | 39 |
| 2022 | 7,312 | 1,716 | 2,890 | 2,667 | 39 |
| 2024 | 7,403 | 1,530 | 3,017 | 2,807 | 49 |
Who moves in and out
Net migration over time, and who arrivals are — where they came from and what those places vote
−135 net domestic migration · 2025
Net −1,421 over 2011–2025 · gain loss
Arrivals reported $48,676 in average income, against $74,417 for residents who stayed — 35% lower. (IRS SOI, 2022–23)
The places arrivals came from lean R+6.3 on average — 35 points more Democratic-leaning than Louisa County, IA itself (R+40.9).
Where arrivals came from lean of each source
- Muscatine County, IA82R+14.9
- Des Moines County, IA20R+15.0
- Johnson County, IA20D+37.8
Where departures went households, 2022–23
- Muscatine County, IA82
- Des Moines County, IA33
- Johnson County, IA33
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 | −47 |
| 2012 | −82 |
| 2013 | −81 |
| 2014 | −184 |
| 2015 | −57 |
| 2016 | −154 |
| 2017 | −81 |
| 2018 | −97 |
| 2019 | −151 |
| 2021 | −85 |
| 2022 | −132 |
| 2023 | −159 |
| 2024 | +24 |
| 2025 | −135 |
Louisa County sits along the Iowa–Illinois border and has moved from a perennial swing county in the early 2000s to one of Iowa's most lopsided presidential results, reflecting broader rural realignment across the state's agricultural flatlands.
Across the recorded series it reached a Democratic high of 17.4 points in 1964 and a Republican high of 57.2 points in 1920. Between 2020 and 2024 the county moved 7.6 points toward the Republican candidate; the 2024 margin was 40.9 points.
A population of 10,678, a 77% non-Hispanic-white share, and a median household income of $77,354 describe the county. The county's voting pattern over the last decade is most similar to that of Tama County and Warren 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 →
Louisa County, Iowa. Akashic. https://akashic.app/county/19115/. Accessed May 20, 2026. License: CC BY 4.0.