Iowa 1st Congressional District
Akashic| Year | Margin (D minus R) |
|---|---|
| 2008 | +15.7% |
| 2012 | +13.3% |
| 2016 | −3.0% |
| 2020 | −2.9% |
| 2024 | −8.4% |
Federal officeholders only. State and local officeholders are planned for the next data pass.
U.S. House
Each result reflects the U.S. House district as it was drawn for that election; redistricting has redrawn these lines over time, so they can differ from the current 120th-Congress district shown on the map above.
| Year | District | Won | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | 1 | R | 49.8%206,156 | 50.0%206,955 | 414,078 |
| 2022 | 1 | R | 46.6%142,173 | 53.4%162,947 | 305,380 |
| 2020 | 1 | R | 48.6%201,347 | 51.2%212,088 | 413,869 |
| 2018 | 1 | D | 51.0%170,342 | 45.9%153,442 | 334,243 |
| 2016 | 1 | R | 46.1%177,403 | 53.7%206,903 | 384,977 |
| 2014 | 1 | R | 48.8%141,145 | 51.1%147,762 | 289,306 |
| 2012 | 1 | D | 56.9%222,422 | 41.6%162,465 | 390,849 |
| 2010 | 1 | D | 49.5%104,428 | 47.5%100,219 | 210,902 |
| 2008 | 1 | D | 64.6%186,991 | 35.4%102,439 | 289,430 |
| 2006 | 1 | D | 55.1%114,322 | 43.2%89,729 | 207,478 |
| 2004 | 1 | R | 43.3%125,490 | 55.2%159,993 | 290,054 |
| 2002 | 1 | R | 42.6%83,779 | 57.2%112,280 | 196,455 |
| 2000 | 1 | R | 36.1%96,283 | 61.8%164,972 | 266,990 |
| 1998 | 1 | R | 42.3%79,529 | 56.6%106,419 | 188,132 |
| 1996 | 1 | R | 45.6%111,595 | 52.8%129,242 | 244,596 |
| 1994 | 1 | R | 37.9%69,461 | 60.2%110,448 | 183,461 |
| 1992 | 1 | R | 31.4%81,600 | 68.6%178,042 | 259,642 |
| 1990 | 1 | R | 0.0%0 | 99.8%90,042 | 90,193 |
| 1988 | 1 | R | 38.4%71,280 | 60.7%112,746 | 185,716 |
| 1986 | 1 | R | 33.6%43,985 | 66.4%86,834 | 130,825 |
| 1984 | 1 | R | 33.2%65,293 | 66.8%131,182 | 196,475 |
| 1982 | 1 | R | 40.8%61,734 | 59.2%89,595 | 151,342 |
| 1980 | 1 | R | 34.9%72,602 | 64.1%133,349 | 208,111 |
| 1978 | 1 | R | 35.8%45,037 | 63.5%79,940 | 125,955 |
| 1976 | 1 | R | 47.8%101,024 | 51.9%109,694 | 211,204 |
U.S. Senate
| Year | Won | Democratic | Republican | Total |
|---|---|---|---|---|
| 2022 | R | 43.8%533,330 | 56.0%681,501 | 1,216,646 |
| 2020 | R | 45.2%754,859 | 51.8%864,997 | 1,670,617 |
| 2016 | R | 35.7%549,460 | 60.2%926,007 | 1,539,351 |
| 2014 | R | 43.8%494,370 | 52.2%588,575 | 1,128,589 |
| 2010 | R | 33.3%371,686 | 64.4%718,215 | 1,115,191 |
| 2008 | D | 62.7%941,665 | 37.3%560,006 | 1,501,671 |
| 2004 | R | 27.9%412,365 | 70.2%1,038,175 | 1,478,753 |
| 2002 | D | 54.2%554,278 | 43.8%447,892 | 1,022,374 |
| 1998 | R | 30.5%289,049 | 68.4%648,480 | 947,632 |
| 1996 | D | 51.8%634,166 | 46.7%571,807 | 1,224,054 |
| 1992 | R | 27.2%351,561 | 69.6%899,761 | 1,292,201 |
| 1990 | D | 54.5%535,975 | 45.4%446,869 | 983,933 |
| 1986 | R | 33.6%299,406 | 66.0%588,880 | 891,762 |
| 1984 | D | 55.5%716,883 | 43.7%564,381 | 1,292,700 |
| 1980 | R | 45.5%581,545 | 53.5%683,014 | 1,276,986 |
| 1978 | R | 47.9%395,066 | 51.1%421,598 | 824,576 |
Iowa's 1st district stretches from the Cedar Rapids metro into rural eastern counties, a mix that once made it a genuine swing seat but has shifted steadily toward Republican margins over the past three election cycles.
Across the recorded series it reached a Democratic high of 15.7 points in 2008 and a Republican high of 8.4 points in 2024. Between 2020 and 2024 the district moved 5.5 points toward the Republican candidate; the 2024 margin was 8.4 points.
A population of 797,584, a 85% non-Hispanic-white share, and a median household income of $73,680 describe the district. The district's voting pattern over the last decade is most similar to that of Congressional District 2 and Congressional District 3.
The congressional districts 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.
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 →
Iowa 1st Congressional District. Akashic. https://akashic.app/cd/1901/. Accessed May 20, 2026. License: CC BY 4.0.