Johnson County, Iowa
Precinct data
Results by precinct
65 precincts · 86,068 votes
Precinct boundaries and identifiers are cycle-specific. This table does not join rows across years without a validated crosswalk.
| Precinct -CV.06CV.06 | 1,539 | 569 | 22 | 2,130 | 72.3% | 26.7% | D+45.5 |
|---|---|---|---|---|---|---|---|
| Precinct -IC.17IC.17 | 1,683 | 250 | 29 | 1,962 | 85.8% | 12.7% | D+73.0 |
| Precinct -CV.02CV.02 | 1,346 | 568 | 25 | 1,939 | 69.4% | 29.3% | D+40.1 |
| Precinct -IC.16/SC.90IC.16/SC.90 | 1,497 | 410 | 28 | 1,935 | 77.4% | 21.2% | D+56.2 |
| Precinct -TF.02TF.02 | 1,085 | 793 | 21 | 1,899 | 57.1% | 41.8% | D+15.4 |
| Precinct -IC.23IC.23 | 1,512 | 359 | 27 | 1,898 | 79.7% | 18.9% | D+60.7 |
| Precinct -IC.01IC.01 | 1,483 | 390 | 19 | 1,892 | 78.4% | 20.6% | D+57.8 |
| Precinct -TF.01/CCTF.01/CC | 1,059 | 800 | 25 | 1,884 | 56.2% | 42.5% | D+13.7 |
| Precinct -SOSO | 886 | 953 | 24 | 1,863 | 47.6% | 51.2% | R+3.6 |
| Precinct -PN/CV ANXPN/CV ANX | 1,221 | 591 | 26 | 1,838 | 66.4% | 32.2% | D+34.3 |
| Precinct -IC.24IC.24 | 1,347 | 452 | 28 | 1,827 | 73.7% | 24.7% | D+49.0 |
| Precinct -IC.06IC.06 | 1,441 | 334 | 19 | 1,794 | 80.3% | 18.6% | D+61.7 |
| Precinct -JE/SHJE/SH | 810 | 921 | 20 | 1,751 | 46.3% | 52.6% | R+6.3 |
| Precinct -IC.02IC.02 | 1,338 | 360 | 25 | 1,723 | 77.7% | 20.9% | D+56.8 |
| Precinct -IC.20IC.20 | 1,244 | 449 | 24 | 1,717 | 72.5% | 26.2% | D+46.3 |
| Precinct -IC.11IC.11 | 1,095 | 571 | 22 | 1,688 | 64.9% | 33.8% | D+31.0 |
| Precinct -NPNP | 990 | 679 | 10 | 1,679 | 59.0% | 40.4% | D+18.5 |
| Precinct -NL.02NL.02 | 1,068 | 592 | 18 | 1,678 | 63.6% | 35.3% | D+28.4 |
| Precinct -NL.07/MD.85NL.07/MD.85 | 1,077 | 578 | 23 | 1,678 | 64.2% | 34.4% | D+29.7 |
| Precinct -CV.07CV.07 | 1,228 | 424 | 23 | 1,675 | 73.3% | 25.3% | D+48.0 |
| Precinct -IC.04IC.04 | 1,367 | 247 | 17 | 1,631 | 83.8% | 15.1% | D+68.7 |
| Precinct -IC.22/ELNIC.22/ELN | 1,303 | 282 | 19 | 1,604 | 81.2% | 17.6% | D+63.7 |
| Precinct -JW/MN/SWJW/MN/SW | 724 | 842 | 17 | 1,583 | 45.7% | 53.2% | R+7.5 |
| Precinct -IC.21IC.21 | 1,154 | 373 | 38 | 1,565 | 73.7% | 23.8% | D+49.9 |
| Precinct -IC.14IC.14 | 1,322 | 211 | 24 | 1,557 | 84.9% | 13.6% | D+71.4 |
| Precinct -NL.03NL.03 | 960 | 572 | 15 | 1,547 | 62.1% | 37.0% | D+25.1 |
| Precinct -IC.25IC.25 | 1,247 | 276 | 12 | 1,535 | 81.2% | 18.0% | D+63.3 |
| Precinct -CV.03CV.03 | 1,037 | 459 | 14 | 1,510 | 68.7% | 30.4% | D+38.3 |
| Precinct -IC.08IC.08 | 1,099 | 365 | 14 | 1,478 | 74.4% | 24.7% | D+49.7 |
| Precinct -IC.19IC.19 | 958 | 492 | 20 | 1,470 | 65.2% | 33.5% | D+31.7 |
| Precinct -NL.01NL.01 | 913 | 507 | 21 | 1,441 | 63.4% | 35.2% | D+28.2 |
| Precinct -IC.18IC.18 | 1,244 | 162 | 18 | 1,424 | 87.4% | 11.4% | D+76.0 |
| Precinct -IC.09IC.09 | 1,121 | 269 | 22 | 1,412 | 79.4% | 19.1% | D+60.3 |
| Precinct -NL.06NL.06 | 862 | 478 | 27 | 1,367 | 63.1% | 35.0% | D+28.1 |
| Precinct -NL.05NL.05 | 940 | 395 | 22 | 1,357 | 69.3% | 29.1% | D+40.2 |
| Precinct -IC.13IC.13 | 990 | 328 | 26 | 1,344 | 73.7% | 24.4% | D+49.3 |
| Precinct -CV.01CV.01 | 970 | 352 | 18 | 1,340 | 72.4% | 26.3% | D+46.1 |
| Precinct -IC.05IC.05 | 887 | 426 | 12 | 1,325 | 66.9% | 32.2% | D+34.8 |
| Precinct -BG/SO ANXBG/SO ANX | 598 | 699 | 16 | 1,313 | 45.5% | 53.2% | R+7.7 |
| Precinct -IC.03IC.03 | 780 | 512 | 18 | 1,310 | 59.5% | 39.1% | D+20.5 |
| Precinct -NL.04NL.04 | 897 | 383 | 19 | 1,299 | 69.1% | 29.5% | D+39.6 |
| Precinct -IC.12IC.12 | 980 | 286 | 23 | 1,289 | 76.0% | 22.2% | D+53.8 |
| Precinct -NL.08NL.08 | 836 | 431 | 22 | 1,289 | 64.9% | 33.4% | D+31.4 |
| Precinct -CV.04CV.04 | 990 | 272 | 21 | 1,283 | 77.2% | 21.2% | D+56.0 |
| Precinct -IC.26IC.26 | 935 | 274 | 14 | 1,223 | 76.5% | 22.4% | D+54.0 |
| Precinct -IC.10/ELSWIC.10/ELSW | 813 | 340 | 18 | 1,171 | 69.4% | 29.0% | D+40.4 |
| Precinct -FR/LN/LTFR/LN/LT | 520 | 599 | 19 | 1,138 | 45.7% | 52.6% | R+6.9 |
| Precinct -IC.15/ELSEIC.15/ELSE | 727 | 268 | 16 | 1,011 | 71.9% | 26.5% | D+45.4 |
| Precinct -CV.05CV.05 | 773 | 220 | 15 | 1,008 | 76.7% | 21.8% | D+54.9 |
| Precinct -HS/LB/PVHS/LB/PV | 545 | 445 | 11 | 1,001 | 54.4% | 44.5% | D+10.0 |
| Precinct -IC.07IC.07 | 738 | 230 | 8 | 976 | 75.6% | 23.6% | D+52.0 |
| Precinct -CV.08CV.08 | 749 | 206 | 12 | 967 | 77.5% | 21.3% | D+56.2 |
| Precinct -SC/WB/IC ANXSC/WB/IC ANX | 580 | 340 | 13 | 933 | 62.2% | 36.4% | D+25.7 |
| Precinct -OXOX | 411 | 467 | 16 | 894 | 46.0% | 52.2% | R+6.3 |
| Precinct -IC.27IC.27 | 606 | 187 | 10 | 803 | 75.5% | 23.3% | D+52.2 |
| Precinct -UHUH | 608 | 151 | 6 | 765 | 79.5% | 19.7% | D+59.7 |
| Precinct -WLWL | 374 | 206 | 5 | 585 | 63.9% | 35.2% | D+28.7 |
| Precinct -WSWS | 206 | 318 | 12 | 536 | 38.4% | 59.3% | R+20.9 |
| Precinct -UNUN | 251 | 207 | 5 | 463 | 54.2% | 44.7% | D+9.5 |
| Precinct -CECE | 173 | 228 | 5 | 406 | 42.6% | 56.2% | R+13.5 |
| Precinct -HDHD | 181 | 193 | 7 | 381 | 47.5% | 50.7% | R+3.1 |
| Precinct -SNSN | 137 | 232 | 4 | 373 | 36.7% | 62.2% | R+25.5 |
| Precinct -MDMD | 173 | 161 | 4 | 338 | 51.2% | 47.6% | D+3.6 |
| Precinct -GRGR | 195 | 134 | 1 | 330 | 59.1% | 40.6% | D+18.5 |
| Precinct -CV.09CV.09 | 23 | 19 | 1 | 43 | 53.5% | 44.2% | D+9.3 |
Presidential margin, 1892–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1892 | +18.9% |
| 1896 | +4.2% |
| 1900 | +2.7% |
| 1904 | +2.0% |
| 1908 | +9.0% |
| 1912 | +28.6% |
| 1916 | +14.8% |
| 1920 | −6.1% |
| 1924 | −9.1% |
| 1928 | −0.7% |
| 1932 | +22.6% |
| 1936 | +21.5% |
| 1940 | +11.1% |
| 1944 | +13.7% |
| 1948 | +9.0% |
| 1952 | −16.4% |
| 1956 | −12.6% |
| 1960 | −1.7% |
| 1964 | +36.3% |
| 1968 | +8.3% |
| 1972 | +16.8% |
| 1976 | +10.6% |
| 1980 | +15.1% |
| 1984 | +16.3% |
| 1988 | +29.8% |
| 1992 | +28.2% |
| 1996 | +31.7% |
| 2000 | +25.2% |
| 2004 | +29.3% |
| 2008 | +41.5% |
| 2012 | +35.5% |
| 2016 | +37.6% |
| 2020 | +43.2% |
| 2024 | +37.8% |
U.S. Senate
| Year | Won | Democratic | Republican | Total |
|---|---|---|---|---|
| 2022 | D | 71.3%45,416 | 28.7%18,245 | 63,661 |
| 2020 | D | 69.1%57,063 | 28.8%23,773 | 82,591 |
Registered voters
By party of registration, over time
Registration leans Democratic; the presidential vote runs 8.4 points more Republican.
| Year | Total registered | Democratic | Republican | Unaffiliated | Other |
|---|---|---|---|---|---|
| 2008 | 102,789 | 47,400 | 19,301 | 35,940 | 148 |
| 2010 | 106,307 | 46,911 | 20,978 | 38,094 | 324 |
| 2012 | 113,238 | 48,707 | 22,736 | 41,366 | 429 |
| 2014 | 111,011 | 47,131 | 22,048 | 41,163 | 669 |
| 2016 | 111,253 | 51,105 | 22,799 | 36,360 | 989 |
| 2018 | 111,696 | 51,399 | 21,333 | 37,829 | 1,135 |
| 2020 | 113,941 | 58,472 | 21,013 | 33,368 | 1,088 |
| 2022 | 114,126 | 56,723 | 20,394 | 35,940 | 1,069 |
| 2024 | 115,249 | 54,599 | 20,756 | 38,772 | 1,122 |
Who moves in and out
Net migration over time, and who arrivals are — where they came from and what those places vote
−175 net domestic migration · 2025
Net +1,237 over 2011–2025 · gain loss
Arrivals reported $61,573 in average income, against $105,068 for residents who stayed — 41% lower. (IRS SOI, 2022–23)
The places arrivals came from lean D+1.7 on average — 36 points more Republican-leaning than Johnson County, IA itself (D+37.8).
Where arrivals came from lean of each source
- Linn County, IA639D+9.9
- Polk County, IA227D+10.8
- Scott County, IA159R+3.9
- Cook County, IL146D+41.6
- Washington County, IA121R+24.4
- Muscatine County, IA119R+14.9
Where departures went households, 2022–23
- Linn County, IA743
- Polk County, IA276
- Cook County, IL228
- Washington County, IA152
- Scott County, IA147
- Cedar County, IA122
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 | +455 |
| 2012 | +1,152 |
| 2013 | +884 |
| 2014 | +389 |
| 2015 | +235 |
| 2016 | +11 |
| 2017 | +336 |
| 2018 | −320 |
| 2019 | −855 |
| 2021 | +668 |
| 2022 | 0 |
| 2023 | −862 |
| 2024 | −681 |
| 2025 | −175 |
Home to the University of Iowa in Iowa City, Johnson County delivers Democratic margins above 35 points in cycles where the rest of the state trends Republican — a pattern driven by a student and academic-professional population that skews younger and more educated than Iowa's norm.
Across the recorded series it reached a Democratic high of 43.2 points in 2020 and a Republican high of 16.4 points in 1952. Between 2020 and 2024 the county moved 5.4 points toward the Republican candidate; the 2024 margin was 37.8 points.
A population of 156,639, a 75% non-Hispanic-white share, and a median household income of $74,935 describe the county. The county's voting pattern over the last decade is most similar to that of Dane County and Polk 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 →
Johnson County, Iowa. Akashic. https://akashic.app/county/19103/. Accessed May 20, 2026. License: CC BY 4.0.