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Decatur County, IA


Designated Market Area: Des Moines-Ames, IA-MO
American Communities Project County Type (2023): Rural Middle America

Places in Decatur County, IA     [Sort places by name]

 

Tracts in Decatur County, IA

   



Click here to view demographic data for Decatur County, IA

2024 population: 7,656   ( 111 from 2020)
Land area: 531.9 square miles
Population density: 14.4 persons per square mile

2024 Census data
White:6,937 90.61% 3.1%
Black:1622.12% 3.8%
Indian:370.48% 8.8%
Asian:881.15% 7.3%
2+ races:1081.41% 2.9%
Hispanic:3244.23% 40.3%
Total non-White:7199.39% 18.3%

2020-2024 ComponentsNumberRate
Births:331 10.7
Deaths:44014.2
Net Migration: -58-1.9
Net Immigration: 632.0
Change in White population:-222 -2.9
Change in Non-White pop.:111 1.4



Historical Presidential Election Results for Decatur County, IA

Recent Trends
VotesΔ MarginSwing %
2024 vs. 2020 R +96 R +259 R + 7.8%
D -163
2024 vs. 2016 R +415 R +659 R + 16.5%
D -244
2020 vs. 2016 R +319 R +400 R + 8.7%
D -81
2024 vs. 2012 R +764 R +1,598 R + 43.6%
D -834
2016 vs. 2008 R +276 R +1,061 R + 30.5%
D -785
How to interpret this table


Click on the Year to view county-level data for that election.

YearTurnout WinnerRunner-Up OtherTotal Votes Diff
(St) 		Diff
(US) 		PSV
2024 63% Donald Trump (R) 2,711 72.5% Kamala Harris (D) 957 25.6% 71 [+] 1.9% 3,739 17 23 0.22%
2020 64% Donald Trump* (R) 2,615 68.7% Joe Biden (D) 1,120 29.4% 69 [+] 1.8% 3,804 16 22 0.22%
2016 60% Donald Trump (R) 2,296 61.5% Hillary Clinton (D) 1,201 32.2% 237 [+] 6.3% 3,734 10 16 0.24%
2012 60% Mitt Romney (R) 1,947 50.8% Barack Obama* (D) 1,791 46.7% 95 [+] 2.5% 3,833 5 4 0.24%
2008 63% John McCain (R) 2,020 49.2% Barack Obama (D) 1,986 48.4% 100 [+] 2.4% 4,106 5 4 0.27%
2004 61% George W. Bush* (R) 2,088 52.1% John Kerry (D) 1,859 46.3% 64 [+] 1.6% 4,011 2 1 0.27%
2000 56% George W. Bush (R) 1,903 51.3% Albert Gore, Jr. (D) 1,674 45.1% 132 [+] 3.6% 3,709 3 3 0.28%
1996 55% Bill Clinton* (D) 1,846 51.0% Robert Dole (R) 1,287 35.5% 490 [+] 13.5% 3,623 -4 -5 0.29%
1992 62% Bill Clinton (D) 1,866 46.8% George Bush* (R) 1,316 33.0% 804 [+] 20.2% 3,986 -4 -4 0.29%
1988 55% Michael Dukakis (D) 2,192 60.4% George Bush (R) 1,406 38.8% 29 [+] 0.8% 3,627 -6 -15 0.30%
1984 60% Ronald Reagan* (R) 2,104 49.6% Walter Mondale (D) 2,098 49.5% 40 0.9% 4,242 -4 -9 0.32%
1980 62% Ronald Reagan (R) 2,212 47.7% Jimmy Carter* (D) 2,048 44.1% 380 [+] 8.2% 4,640 -4 -3 0.35%
1976 67% Jimmy Carter (D) 2,698 57.3% Gerald Ford* (R) 1,932 41.0% 77 [+] 1.6% 4,707 -8 -7 0.37%
1972 66% Richard Nixon* (R) 2,638 57.4% George McGovern (D) 1,880 40.9% 75 [+] 1.6% 4,593 0 -3 0.37%
1968 72% Richard Nixon (R) 2,261 49.3% Hubert Humphrey (D) 2,057 44.8% 270 [+] 5.9% 4,588 -4 6 0.39%
1964 75% Lyndon Johnson* (D) 3,331 68.2% Barry Goldwater (R) 1,542 31.6% 12 0.2% 4,885 -6 -7 0.41%
1960 81% Richard Nixon (R) 3,039 55.7% John Kennedy (D) 2,411 44.2% 7 0.1% 5,457 -1 6 0.43%
1956 74% Dwight Eisenhower* (R) 2,912 50.9% Adlai Stevenson (D) 2,806 49.0% 7 0.1% 5,725 -8 -7 0.46%
1952 74% Dwight Eisenhower (R) 3,621 58.7% Adlai Stevenson (D) 2,521 40.9% 26 0.4% 6,168 -5 4 0.49%
1948 66% Harry Truman* (D) 3,172 54.7% Thomas Dewey (R) 2,547 43.9% 84 [+] 1.4% 5,803 -4 -1 0.56%
1944 68% Franklin Roosevelt* (D) 3,316 52.9% Thomas Dewey (R) 2,934 46.8% 18 0.3% 6,268 -5 1 0.60%
1940 78% Franklin Roosevelt* (D) 3,938 52.9% Wendell Willkie (R) 3,494 46.9% 16 0.2% 7,448 -5 2 0.61%
1936 81% Franklin Roosevelt* (D) 4,131 55.1% Alf Landon (R) 3,327 44.4% 36 [+] 0.5% 7,494 2 8 0.66%
1932 61% Franklin Roosevelt (D) 3,591 61.6% Herbert Hoover* (R) 2,148 36.8% 91 [+] 1.6% 5,830 -3 -3 0.56%
1928 69% Herbert Hoover (R) 3,942 59.6% Al Smith (D) 2,675 40.4% 0 0.0% 6,617 -2 1 0.66%
1924 68% Calvin Coolidge (R) 3,221 47.2% Robert LaFollette (Prog) 1,917 28.1% 1,693 [+] 24.8% 6,831 -8 -7 0.70%
1920 66% Warren Harding (R) 4,187 61.2% James Cox (D) 2,592 37.9% 66 [+] 1.0% 6,845 -10 1 0.76%
1916 41% Woodrow Wilson* (D) 2,111 51.1% Charles Evans Hughes (R) 1,962 47.4% 62 [+] 1.5% 4,135 -7 1 0.80%
1912 39% Woodrow Wilson (D) 1,659 42.2% William Taft* (R) 1,351 34.4% 918 [+] 23.4% 3,928 10 11 0.80%
1908 42% William Taft (R) 2,149 52.5% William J. Bryan (D) 1,809 44.2% 133 [+] 3.3% 4,091 -3 1 0.83%
1904 41% Theodore Roosevelt (R) 2,430 58.4% Alton Parker (D) 1,548 37.2% 180 [+] 4.3% 4,158 -5 2 0.86%
1900 43% William McKinley* (R) 2,415 53.2% William J. Bryan (D) 2,058 45.3% 66 [+] 1.5% 4,539 -5 2 0.86%
* incumbent         PSV: percent of state vote

Historical Statewide Election Results for Decatur County, IA

Click on the Year to view county-level data for that election.

YearTypeTurnout WinnerRunner-Up OtherTotal VotesDiff PSV
2022 S3 46% Charles Grassley* (R) 1,944 70.8% Michael Franken (D) 794 28.9% 7 [+] 0.3% 2,745 15 0.23%
2022 G 47% Kim Reynolds* (R) 2,081 74.5% Deidre DeJear (D) 651 23.3% 61 [+] 2.2% 2,793 16 0.23%
2020 S2 63% Joni Ernst* (R) 2,439 65.2% Theresa Greenfield (D) 1,165 31.1% 136 [+] 3.6% 3,740 13 0.22%
2018 G 49% Kim Reynolds* (R) 1,872 63.3% Fred Hubbell (D) 1,008 34.1% 76 [+] 2.6% 2,956 13 0.22%
2016 S3 60% Charles Grassley* (R) 2,488 67.6% Patty Judge (D) 1,037 28.2% 156 [+] 4.2% 3,681 8 0.24%
2014 S2 41% Joni Ernst (R) 1,496 57.7% Bruce Braley (D) 857 33.1% 238 [+] 9.2% 2,591 6 0.23%
2014 G 42% Terry Branstad* (R) 1,717 65.5% Jack Hatch (D) 768 29.3% 137 [+] 5.2% 2,622 6 0.23%
2010 S3 44% Charles Grassley* (R) 1,937 67.4% Roxanne Conlin (D) 846 29.4% 92 [+] 3.2% 2,875 3 0.26%
2010 G 45% Terry Branstad (R) 1,685 57.8% Chet Culver* (D) 1,074 36.8% 156 [+] 5.4% 2,915 5 0.26%
2008 S2 61% Tom Harkin* (D) 2,448 60.8% Christopher Reed (R) 1,577 39.2% 0 0.0% 4,025 2 0.27%
2006 G 44% Chet Culver (D) 1,526 52.3% Jim Nussle (R) 1,335 45.8% 57 [+] 2.0% 2,918 1 0.28%
2004 S3 60% Charles Grassley* (R) 2,959 74.7% Art Small (D) 897 22.7% 103 [+] 2.6% 3,959 5 0.27%
2002 S2 44% Tom Harkin* (D) 1,618 55.5% Greg Ganske (R) 1,222 41.9% 76 [+] 2.6% 2,916 -2 0.29%
2002 G 44% Tom Vilsack* (D) 1,520 51.7% Doug Gross (R) 1,318 44.8% 101 [+] 3.4% 2,939 0 0.29%
1998 S3 51% Charles Grassley* (R) 2,538 74.6% David Osterberg (D) 827 24.3% 37 [+] 1.1% 3,402 6 0.36%
1998 G 46% Jim Ross Lightfoot (R) 1,621 53.3% Tom Vilsack (D) 1,389 45.6% 33 [+] 1.1% 3,043 7 0.32%
1996 S2 55% Jim Ross Lightfoot (R) 1,813 50.0% Tom Harkin* (D) 1,775 48.9% 41 [+] 1.1% 3,629 3 0.30%
1994 G 47% Terry Branstad* (R) 1,562 51.4% Bonnie Campbell (D) 1,446 47.6% 28 [+] 0.9% 3,036 -5 0.30%
1992 S3 60% Charles Grassley* (R) 2,694 69.2% Jean Lloyd-Jones (D) 1,051 27.0% 149 [+] 3.8% 3,894 0 0.30%
1990 S2 46% Tom Harkin* (D) 1,909 65.1% Tom Tauke (R) 1,024 34.9% 1 [+] 0.0% 2,934 -11 0.30%
1990 G 46% Terry Branstad* (R) 1,783 61.2% Donald Avenson (D) 1,109 38.1% 21 [+] 0.7% 2,913 1 0.30%
1986 S3 46% Charles Grassley* (R) 2,198 69.3% John Roehrick (D) 939 29.6% 35 [+] 1.1% 3,172 3 0.36%
1986 G 47% Terry Branstad* (R) 1,692 52.7% Lowell Junkins (D) 1,517 47.2% 3 [+] 0.1% 3,212 1 0.35%
1984 S2 59% Tom Harkin (D) 2,697 64.5% Roger Jepsen* (R) 1,473 35.2% 14 [+] 0.3% 4,184 -8 0.32%
1982 G 49% Terry Branstad (R) 1,787 50.5% Roxanne Conlin (D) 1,731 48.9% 21 [+] 0.6% 3,539 -2 0.34%
1980 S3 60% Charles Grassley (R) 2,287 50.9% John Culver* (D) 2,179 48.5% 29 [+] 0.6% 4,495 -3 0.35%
1978 S2 50% Dick Clark* (D) 1,928 54.7% Roger Jepsen (R) 1,578 44.8% 16 [+] 0.5% 3,522 -6 0.43%
1978 G 51% Robert Ray* (R) 1,841 51.2% Jerry Fitzgerald (D) 1,747 48.5% 11 [+] 0.3% 3,599 -7 0.43%
1974 S3 56% John Culver (D) 1,983 51.1% David Stanley (R) 1,874 48.3% 22 [+] 0.6% 3,879 1 0.44%
1974 G 58% Robert Ray* (R) 2,213 55.1% James Schaben (D) 1,767 44.0% 38 [+] 0.9% 4,018 -3 0.44%
1972 S2 64% Dick Clark (D) 2,491 56.0% Jack Miller* (R) 1,947 43.7% 13 [+] 0.3% 4,451 0 0.37%
1972 G 65% Robert Ray* (R) 2,581 57.4% Paul Franzenburg (D) 1,871 41.6% 42 [+] 0.9% 4,494 -1 0.37%
1970 G 53% Robert Ray* (R) 1,782 52.0% Robert Fulton (D) 1,561 45.6% 82 [+] 2.4% 3,425 1 0.43%
1968 S3 71% Harold Hughes (D) 2,283 50.6% David Stanley (R) 2,225 49.4% 0 0.0% 4,508 0 0.39%
1968 G 70% Robert Ray (R) 2,243 50.6% Paul Franzenburg (D) 2,186 49.4% 0 0.0% 4,429 -3 0.39%
1966 S2 59% Jack Miller* (R) 2,102 55.6% E.B. Smith (D) 1,647 43.5% 33 [+] 0.9% 3,782 -5 0.44%
1966 G 61% Harold Hughes* (D) 2,272 57.6% William Murray (R) 1,624 41.2% 48 [+] 1.2% 3,944 -2 0.44%
1964 G 74% Harold Hughes* (D) 3,284 67.9% Evan Hultman (R) 1,517 31.4% 33 [+] 0.7% 4,834 0 0.41%
1962 S3 60% E.B. Smith (D) 2,058 51.5% Bourke Hickenlooper* (R) 1,942 48.5% 0 0.0% 4,000 -5 0.50%
1962 G 61% Harold Hughes (D) 2,236 55.3% Norman Erbe* (R) 1,808 44.7% 0 0.0% 4,044 -3 0.49%
1960 S2 79% Herschel Loveless (D) 2,857 53.9% Jack Miller (R) 2,446 46.1% 0 0.0% 5,303 -6 0.43%
1960 G 78% Norman Erbe (R) 2,677 50.9% Edward McManus (D) 2,586 49.1% 0 0.0% 5,263 -1 0.43%
*: incumbent               +: ran on additional party lines               Type: G: Governor; S1,S2,S3: Senate Class 1, 2 or 3
italics: special election           RO: runoff election           PSV: percent of state vote


Historical U.S. House Election Results for Decatur County, IA

Click on the District to view county-level data for that election (where available).

DateDistrictWinnerRunner-Up OtherTotal Votes
2024-11-05 IA03Zach Nunn* (R) 2,489 69.4% Lanon Baccam (D) 1,073 29.9% 22 0.6% 3,584
County Total for 2024-11-05:   3,584
2022-11-08 IA03Zach Nunn (R) 1,890 69.2% Cindy Axne* (D) 835 30.6% 6 0.2% 2,731
County Total for 2022-11-08:   2,731
2020-11-03 IA02Mariannette Miller-Meeks (R) 2,347 65.7% Rita Hart (D) 1,215 34.0% 9 0.3% 3,571
County Total for 2020-11-03:   3,571
2018-11-06 IA02Christopher Peters (R) 1,651 57.2% Dave Loebsack* (D) 1,122 38.9% 113 3.9% 2,886
County Total for 2018-11-06:   2,886
2016-11-08 IA02Christopher Peters (R) 1,914 54.7% Dave Loebsack* (D) 1,577 45.1% 8 0.2% 3,499
County Total for 2016-11-08:   3,499
2014-11-04 IA02Mariannette Miller-Meeks (R) 1,341 52.9% Dave Loebsack* (D) 1,190 47.0% 3 0.1% 2,534
County Total for 2014-11-04:   2,534
2012-11-06 IA02Dave Loebsack* (D) 1,758 48.8% John Archer (R) 1,743 48.4% 100 2.8% 3,601
County Total for 2012-11-06:   3,601
2010-11-02 IA05Steve King* (R) 1,756 62.3% Matthew Campbell (D) 984 34.9% 79 2.8% 2,819
County Total for 2010-11-02:   2,819
2008-11-04 IA05Steve King* (R) 2,080 53.1% Rob Hubler (D) 1,688 43.1% 148 3.8% 3,916
County Total for 2008-11-04:   3,916
2006-11-07 IA05Steve King* (R) 1,439 52.0% Joyce Schulte (D) 1,239 44.8% 89 3.2% 2,767
County Total for 2006-11-07:   2,767
2004-11-02 IA05Steve King* (R) 2,132 56.2% Joyce Schulte (D) 1,658 43.7% 3 0.1% 3,793
County Total for 2004-11-02:   3,793
2002-11-05 IA05Steve King (R) 1,589 58.3% Paul Shomshor (D) 1,134 41.6% 1 0.0% 2,724
County Total for 2002-11-05:   2,724
2000-11-07 IA03Leonard Boswell* (D) 2,732 74.1% Jay Marcus (R) 881 23.9% 73 2.0% 3,686
County Total for 2000-11-07:   3,686
1998-11-03 IA03Leonard Boswell* (D) 2,239 73.7% Larry McKibben (R) 768 25.3% 32 1.1% 3,039
County Total for 1998-11-03:   3,039
1996-11-05 IA03Leonard Boswell (D) 2,398 66.4% Mike Mahaffey (R) 1,174 32.5% 41 1.1% 3,613
County Total for 1996-11-05:   3,613
1994-11-08 IA03Jim Ross Lightfoot* (R) 1,850 62.0% Elaine Baxter (D) 1,093 36.6% 43 1.4% 2,986
County Total for 1994-11-08:   2,986
1992-11-03 IA03Jim Ross Lightfoot* (R) 2,026 52.0% Elaine Baxter (D) 1,633 41.9% 240 6.2% 3,899
County Total for 1992-11-03:   3,899
*: incumbent           sp: special election           RO: runoff election

Voter Registration Data for Decatur County, IA

YearTotalRepublicanDemocratOtherR/D EdgeR/D Edge %VAPOP %
2024 3,549 1,994 56.2% 740 20.9% 815 23.0% Rep +1,254 Rep +35.3% 60%
2022 4,159 1,966 47.3% 1,012 24.3% 1,181 28.4% Rep +954 Rep +22.9% 70%
2020 4,672 2,006 42.9% 1,317 28.2% 1,349 28.9% Rep +689 Rep +14.7% 78%
2018 4,483 1,753 39.1% 1,312 29.3% 1,418 31.6% Rep +441 Rep +9.8% 74%
2016 4,717 1,795 38.1% 1,458 30.9% 1,464 31.0% Rep +337 Rep +7.1% 76%
2014 4,692 1,609 34.3% 1,496 31.9% 1,587 33.8% Rep +113 Rep +2.4% 74%
2012 5,464 1,805 33.0% 1,796 32.9% 1,863 34.1% Rep +9 Rep +0.2% 85%
2010 5,744 1,864 32.5% 1,940 33.8% 1,940 33.8% Dem +76 Dem +1.3% 88%
2008 5,881 1,832 31.2% 2,100 35.7% 1,949 33.1% Dem +268 Dem +4.6% 90%
2006 5,622 1,783 31.7% 1,930 34.3% 1,909 34.0% Dem +147 Dem +2.6% 85%
2004 5,759 1,832 31.8% 1,969 34.2% 1,958 34.0% Dem +137 Dem +2.4% 87%
2002 5,229 1,778 34.0% 1,757 33.6% 1,694 32.4% Rep +21 Rep +0.4% 79%
2000 5,252 1,764 33.6% 1,862 35.5% 1,626 31.0% Dem +98 Dem +1.9% 79%
1994 4,837 1,669 34.5% 2,059 42.6% 1,109 22.9% Dem +390 Dem +8.1% 74%
1986 5,457 1,799 33.0% 2,332 42.7% 1,326 24.3% Dem +533 Dem +9.8% 80%
VAPOP% is the estimated percentage of voting age population that is registered.
Registration data may include "inactive" voters.   Data for each year pertains to the November elections.