Dubuque County, Iowa
Precinct data
Results by precinct
34 precincts · 52,566 votes
Precinct boundaries and identifiers are cycle-specific. This table does not join rows across years without a validated crosswalk.
| Precinct -3232 | 954 | 1,394 | 28 | 2,376 | 40.2% | 58.7% | R+18.5 |
|---|---|---|---|---|---|---|---|
| Precinct -2222 | 912 | 1,265 | 21 | 2,198 | 41.5% | 57.6% | R+16.1 |
| Precinct -3333 | 781 | 1,391 | 23 | 2,195 | 35.6% | 63.4% | R+27.8 |
| Precinct -2323 | 750 | 1,320 | 24 | 2,094 | 35.8% | 63.0% | R+27.2 |
| Precinct -2121 | 1,101 | 963 | 22 | 2,086 | 52.8% | 46.2% | D+6.6 |
| Precinct -2020 | 1,138 | 880 | 26 | 2,044 | 55.7% | 43.1% | D+12.6 |
| Precinct -22 | 1,109 | 877 | 19 | 2,005 | 55.3% | 43.7% | D+11.6 |
| Precinct -3434 | 727 | 1,244 | 26 | 1,997 | 36.4% | 62.3% | R+25.9 |
| Precinct -55 | 950 | 1,020 | 21 | 1,991 | 47.7% | 51.2% | R+3.5 |
| Precinct -66 | 953 | 1,010 | 28 | 1,991 | 47.9% | 50.7% | R+2.9 |
| Precinct -2626 | 539 | 1,372 | 24 | 1,935 | 27.9% | 70.9% | R+43.0 |
| Precinct -44 | 889 | 921 | 17 | 1,827 | 48.7% | 50.4% | R+1.8 |
| Precinct -11 | 794 | 917 | 16 | 1,727 | 46.0% | 53.1% | R+7.1 |
| Precinct -3131 | 588 | 1,018 | 21 | 1,627 | 36.1% | 62.6% | R+26.4 |
| Precinct -1212 | 825 | 774 | 22 | 1,621 | 50.9% | 47.7% | D+3.1 |
| Precinct -2929 | 463 | 1,123 | 10 | 1,596 | 29.0% | 70.4% | R+41.4 |
| Precinct -77 | 820 | 750 | 15 | 1,585 | 51.7% | 47.3% | D+4.4 |
| Precinct -88 | 816 | 733 | 26 | 1,575 | 51.8% | 46.5% | D+5.3 |
| Precinct -1515 | 810 | 727 | 28 | 1,565 | 51.8% | 46.5% | D+5.3 |
| Precinct -33 | 806 | 655 | 14 | 1,475 | 54.6% | 44.4% | D+10.2 |
| Precinct -2424 | 452 | 990 | 23 | 1,465 | 30.9% | 67.6% | R+36.7 |
| Precinct -1919 | 771 | 583 | 15 | 1,369 | 56.3% | 42.6% | D+13.7 |
| Precinct -3030 | 527 | 807 | 12 | 1,346 | 39.2% | 60.0% | R+20.8 |
| Precinct -1111 | 635 | 680 | 21 | 1,336 | 47.5% | 50.9% | R+3.4 |
| Precinct -1010 | 675 | 632 | 14 | 1,321 | 51.1% | 47.8% | D+3.3 |
| Precinct -99 | 674 | 597 | 16 | 1,287 | 52.4% | 46.4% | D+6.0 |
| Precinct -1313 | 494 | 544 | 13 | 1,051 | 47.0% | 51.8% | R+4.8 |
| Precinct -1818 | 668 | 350 | 13 | 1,031 | 64.8% | 33.9% | D+30.8 |
| Precinct -1414 | 497 | 443 | 16 | 956 | 52.0% | 46.3% | D+5.6 |
| Precinct -2828 | 248 | 640 | 19 | 907 | 27.3% | 70.6% | R+43.2 |
| Precinct -2727 | 276 | 588 | 13 | 877 | 31.5% | 67.0% | R+35.6 |
| Precinct -1616 | 504 | 323 | 16 | 843 | 59.8% | 38.3% | D+21.5 |
| Precinct -1717 | 430 | 332 | 11 | 773 | 55.6% | 42.9% | D+12.7 |
| Precinct -2525 | 129 | 361 | 4 | 494 | 26.1% | 73.1% | R+47.0 |
Presidential margin, 1892–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1892 | +31.4% |
| 1896 | +11.0% |
| 1900 | +16.5% |
| 1904 | −5.0% |
| 1908 | +16.3% |
| 1912 | +39.4% |
| 1916 | +2.4% |
| 1920 | −22.9% |
| 1924 | −10.1% |
| 1928 | +33.1% |
| 1932 | +46.2% |
| 1936 | +29.3% |
| 1940 | −2.8% |
| 1944 | +1.4% |
| 1948 | +20.9% |
| 1952 | −10.8% |
| 1956 | −15.2% |
| 1960 | +26.7% |
| 1964 | +40.2% |
| 1968 | +12.8% |
| 1972 | +3.1% |
| 1976 | +7.9% |
| 1980 | +0.1% |
| 1984 | +6.4% |
| 1988 | +24.0% |
| 1992 | +15.2% |
| 1996 | +19.6% |
| 2000 | +14.6% |
| 2004 | +13.7% |
| 2008 | +20.8% |
| 2012 | +14.7% |
| 2016 | −1.2% |
| 2020 | −2.9% |
| 2024 | −8.6% |
U.S. Senate
| Year | Won | Democratic | Republican | Total |
|---|---|---|---|---|
| 2022 | R | 46.5%18,020 | 53.5%20,762 | 38,782 |
| 2020 | R | 47.9%25,433 | 49.1%26,034 | 53,043 |
Registered voters
By party of registration, over time
Dubuque County, IA registers Democratic but votes Republican — a 12-point gap between how voters register and how they vote, the signature of ancestral registration that trails realignment.
| Year | Total registered | Democratic | Republican | Unaffiliated | Other |
|---|---|---|---|---|---|
| 2008 | 64,903 | 27,811 | 13,750 | 23,328 | 14 |
| 2010 | 63,916 | 26,907 | 14,323 | 22,656 | 30 |
| 2012 | 67,553 | 26,992 | 15,878 | 24,592 | 91 |
| 2014 | 68,093 | 26,875 | 16,162 | 24,865 | 191 |
| 2016 | 69,564 | 28,054 | 17,438 | 23,723 | 349 |
| 2018 | 69,850 | 27,665 | 17,179 | 24,451 | 555 |
| 2020 | 72,152 | 29,007 | 20,904 | 21,633 | 608 |
| 2022 | 71,290 | 27,207 | 21,001 | 22,425 | 657 |
| 2024 | 71,627 | 25,123 | 22,507 | 23,243 | 754 |
Who moves in and out
Net migration over time, and who arrivals are — where they came from and what those places vote
+177 net domestic migration · 2025
Net −747 over 2011–2025 · gain loss
Arrivals reported $59,508 in average income, against $96,729 for residents who stayed — 38% lower. (IRS SOI, 2022–23)
The places arrivals came from lean R+4.9 on average — 3.7 points more Democratic-leaning than Dubuque County, IA itself (R+8.6).
Where arrivals came from lean of each source
- Jo Daviess County, IL118R+16.8
- Grant County, WI108R+18.1
- Cook County, IL97D+41.6
- Linn County, IA90D+9.9
- Jackson County, IA89R+32.5
- Delaware County, IA68R+39.5
Where departures went households, 2022–23
- Linn County, IA98
- Jackson County, IA96
- Jo Daviess County, IL90
- Grant County, WI78
- Cook County, IL76
- Johnson County, IA69
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 | +265 |
| 2012 | +234 |
| 2013 | +433 |
| 2014 | +127 |
| 2015 | +21 |
| 2016 | −574 |
| 2017 | −48 |
| 2018 | −465 |
| 2019 | +106 |
| 2021 | −572 |
| 2022 | −273 |
| 2023 | −36 |
| 2024 | −142 |
| 2025 | +177 |
Dubuque County, long anchored by its Catholic, union-influenced workforce in Iowa's oldest city, has moved steadily toward Republican margins over the past decade — a shift that mirrors broader realignment among working-class voters in the Midwest.
Across the recorded series it reached a Democratic high of 46.2 points in 1932 and a Republican high of 22.9 points in 1920. Between 2020 and 2024 the county moved 5.7 points toward the Republican candidate; the 2024 margin was 8.6 points.
A population of 99,030, a 88% non-Hispanic-white share, and a median household income of $77,630 describe the county. The county's voting pattern over the last decade is most similar to that of Erie County and Grant 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 →
Dubuque County, Iowa. Akashic. https://akashic.app/county/19061/. Accessed May 20, 2026. License: CC BY 4.0.