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Jefferson County, IA


Micropolitan Statistical Area: Fairfield, IA
Designated Market Area: Ottumwa-Kirksville, IA-MO
American Communities Project County Type (2023): Rural Middle America

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

 

Tracts in Jefferson County, IA

   



Click here to view demographic data for Jefferson County, IA

2022 population: 15,698   ( 1,145 from 2010 , 33 from 2020)
Land area: 435.5 square miles
Population density: 36.0 persons per square mile

2022 Census data
White:13,109 83.51% 9.8%
Black:3802.42% 91.0%
Indian:500.32% 78.6%
Asian:1,2417.91% 12.7%
2+ races:3222.05% 43.8%
Hispanic:5963.80% 45.4%
Total non-White:2,58916.49% 12.4%

2020-2022 ComponentsNumberRate
Births:332 10.6
Deaths:45514.5
Net Migration: -270-8.6
Net Immigration: 40512.9
Change in White population:-1,430 -8.5
Change in Non-White pop.:285 1.7



Historical Presidential Election Results for Jefferson County, IA

Recent Trends
VotesΔ MarginSwing %
2024 vs. 2020 R -90 R +451 R + 5.7%
D -541
2024 vs. 2016 R +605 R +537 R + 6.6%
D +68
2020 vs. 2016 R +695 R +86 R + 0.9%
D +609
2024 vs. 2012 R +917 R +1,937 R + 23.6%
D -1,020
2016 vs. 2008 R +424 R +1,784 R + 21.3%
D -1,360
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 67% Donald Trump (R) 4,353 52.2% Kamala Harris (D) 3,778 45.3% 205 [+] 2.5% 8,336 -4 3 0.50%
2020 72% Donald Trump* (R) 4,443 49.6% Joe Biden (D) 4,319 48.2% 197 [+] 2.2% 8,959 -3 3 0.53%
2016 62% Donald Trump (R) 3,748 46.0% Hillary Clinton (D) 3,710 45.5% 698 [+] 8.6% 8,156 -5 0 0.52%
2012 63% Barack Obama* (D) 4,798 56.2% Mitt Romney (R) 3,436 40.3% 296 [+] 3.5% 8,530 -6 -7 0.54%
2008 64% Barack Obama (D) 5,070 58.7% John McCain (R) 3,324 38.5% 238 [+] 2.8% 8,632 -6 -7 0.56%
2004 65% John Kerry (D) 4,490 54.2% George W. Bush* (R) 3,648 44.1% 143 [+] 1.7% 8,281 -6 -7 0.55%
2000 62% George W. Bush (R) 3,248 43.0% Albert Gore, Jr. (D) 2,863 37.9% 1,437 [+] 19.0% 7,548 -5 -5 0.57%
1996 60% Bill Clinton* (D) 2,597 35.1% Robert Dole (R) 2,541 34.4% 2,259 [+] 30.5% 7,397 -6 -6 0.60%
1992 68% Bill Clinton (D) 2,562 30.7% George Bush* (R) 2,541 30.5% 3,238 [+] 38.8% 8,341 -7 -7 0.62%
1988 59% George Bush (R) 3,614 49.5% Michael Dukakis (D) 3,594 49.3% 88 [+] 1.2% 7,296 5 -4 0.60%
1984 63% Ronald Reagan* (R) 4,727 61.2% Walter Mondale (D) 2,961 38.3% 37 0.5% 7,725 8 2 0.59%
1980 59% Ronald Reagan (R) 4,099 56.2% Jimmy Carter* (D) 2,577 35.3% 623 [+] 8.5% 7,299 5 5 0.55%
1976 64% Gerald Ford* (R) 3,746 51.7% Jimmy Carter (D) 3,377 46.6% 121 [+] 1.7% 7,244 2 4 0.57%
1972 64% Richard Nixon* (R) 4,628 64.8% George McGovern (D) 2,362 33.1% 149 [+] 2.1% 7,139 7 4 0.58%
1968 69% Richard Nixon (R) 4,130 59.5% Hubert Humphrey (D) 2,411 34.7% 398 [+] 5.7% 6,939 7 16 0.59%
1964 69% Lyndon Johnson* (D) 4,135 59.8% Barry Goldwater (R) 2,755 39.8% 26 0.4% 6,916 2 1 0.58%
1960 77% Richard Nixon (R) 4,942 64.0% John Kennedy (D) 2,780 36.0% 0 0.0% 7,722 7 14 0.61%
1956 72% Dwight Eisenhower* (R) 4,807 62.8% Adlai Stevenson (D) 2,845 37.1% 7 0.1% 7,659 4 5 0.62%
1952 77% Dwight Eisenhower (R) 5,630 69.1% Adlai Stevenson (D) 2,470 30.3% 49 0.6% 8,149 5 14 0.64%
1948 67% Thomas Dewey (R) 3,906 55.1% Harry Truman* (D) 3,033 42.8% 149 [+] 2.1% 7,088 8 10 0.68%
1944 69% Thomas Dewey (R) 4,335 59.0% Franklin Roosevelt* (D) 2,926 39.8% 83 1.1% 7,344 7 13 0.70%
1940 78% Wendell Willkie (R) 4,891 58.7% Franklin Roosevelt* (D) 3,402 40.8% 43 0.5% 8,336 7 14 0.69%
1936 78% Alf Landon (R) 4,037 50.8% Franklin Roosevelt* (D) 3,690 46.5% 214 [+] 2.7% 7,941 8 14 0.69%
1932 69% Franklin Roosevelt (D) 4,056 57.0% Herbert Hoover* (R) 2,955 41.6% 99 [+] 1.4% 7,110 2 2 0.69%
1928 70% Herbert Hoover (R) 4,919 69.5% Al Smith (D) 2,159 30.5% 0 0.0% 7,078 8 11 0.70%
1924 65% Calvin Coolidge (R) 4,062 61.6% Robert LaFollette (Prog) 1,279 19.4% 1,249 [+] 19.0% 6,590 7 8 0.67%
1920 60% Warren Harding (R) 4,558 74.6% James Cox (D) 1,450 23.7% 100 [+] 1.6% 6,108 4 14 0.68%
1916 40% Charles Evans Hughes (R) 2,167 54.6% Woodrow Wilson* (D) 1,734 43.7% 67 [+] 1.7% 3,968 0 9 0.77%
1912 38% William Taft* (R) 1,378 37.6% Woodrow Wilson (D) 1,311 35.8% 973 [+] 26.6% 3,662 13 14 0.74%
1908 42% William Taft (R) 2,271 58.3% William J. Bryan (D) 1,439 36.9% 186 [+] 4.8% 3,896 3 7 0.79%
1904 39% Theodore Roosevelt (R) 2,330 62.2% Alton Parker (D) 1,172 31.3% 242 [+] 6.5% 3,744 -1 6 0.77%
1900 42% William McKinley* (R) 2,482 58.7% William J. Bryan (D) 1,612 38.1% 132 [+] 3.1% 4,226 1 7 0.80%
* incumbent         PSV: percent of state vote



2020 President, Jefferson County, IA
CandidateVotesPct
Joe Biden (D) 4,319 48.2%
Donald Trump* (R) 4,443 49.6%
Jo Jorgensen (Lbt) 95 1.1%
Other 102 1.1%
TOTAL 8,959
Turnout: 72% Diff (St): -3 Diff (US): 3


2016 President, Jefferson County, IA
CandidateVotesPct
Hillary Clinton (D) 3,710 45.5%
Donald Trump (R) 3,748 46.0%
Gary Johnson (Lbt) 246 3.0%
Jill Stein (Grn) 256 3.1%
Evan McMullin (I) 25 0.3%
Other 171 2.1%
TOTAL 8,156
Turnout: 62% Diff (St): -5 Diff (US): 0


2012 President, Jefferson County, IA
CandidateVotesPct
Barack Obama* (D) 4,798 56.2%
Mitt Romney (R) 3,436 40.3%
Gary Johnson (Lbt) 126 1.5%
Other 170 2.0%
TOTAL 8,530
Turnout: 63% Diff (St): -6 Diff (US): -7


2008 President, Jefferson County, IA
CandidateVotesPct
Barack Obama (D) 5,070 58.7%
John McCain (R) 3,324 38.5%
Ralph Nader (I) 51 0.6%
Bob Barr (Lbt) 32 0.4%
Other 155 1.8%
TOTAL 8,632
Turnout: 64% Diff (St): -6 Diff (US): -7


2004 President, Jefferson County, IA
CandidateVotesPct
George W. Bush* (R) 3,648 44.1%
John Kerry (D) 4,490 54.2%
Ralph Nader (I) 41 0.5%
Other 102 1.2%
TOTAL 8,281
Turnout: 65% Diff (St): -6 Diff (US): -7


2000 President, Jefferson County, IA
CandidateVotesPct
George W. Bush (R) 3,248 43.0%
Albert Gore, Jr. (D) 2,863 37.9%
Ralph Nader (Grn) 206 2.7%
Pat Buchanan (Ref) 45 0.6%
Other 1,186 15.7%
TOTAL 7,548
Turnout: 62% Diff (St): -5 Diff (US): -5


1996 President, Jefferson County, IA
CandidateVotesPct
Bill Clinton* (D) 2,597 35.1%
Robert Dole (R) 2,541 34.4%
Ross Perot (Ref) 571 7.7%
Ralph Nader (Grn) 47 0.6%
Harry Browne (Lbt) 39 0.5%
Other 1,602 21.7%
TOTAL 7,397
Turnout: 60% Diff (St): -6 Diff (US): -6


1992 President, Jefferson County, IA
CandidateVotesPct
Bill Clinton (D) 2,562 30.7%
George Bush* (R) 2,541 30.5%
Ross Perot (I) 1,241 14.9%
Other 1,997 23.9%
TOTAL 8,341
Turnout: 68% Diff (St): -7 Diff (US): -7


1988 President, Jefferson County, IA
CandidateVotesPct
George Bush (R) 3,614 49.5%
Michael Dukakis (D) 3,594 49.3%
Ron Paul (Lbt) 40 0.5%
Other 48 0.7%
TOTAL 7,296
Turnout: 59% Diff (St): 5 Diff (US): -4


1984 President, Jefferson County, IA
CandidateVotesPct
Ronald Reagan* (R) 4,727 61.2%
Walter Mondale (D) 2,961 38.3%
Other 37 0.5%
TOTAL 7,725
Turnout: 63% Diff (St): 8 Diff (US): 2


1980 President, Jefferson County, IA
CandidateVotesPct
Ronald Reagan (R) 4,099 56.2%
Jimmy Carter* (D) 2,577 35.3%
John Anderson (I) 505 6.9%
Edward Clark (Lbt) 99 1.4%
Other 19 0.3%
TOTAL 7,299
Turnout: 59% Diff (St): 5 Diff (US): 5


1976 President, Jefferson County, IA
CandidateVotesPct
Jimmy Carter (D) 3,377 46.6%
Gerald Ford* (R) 3,746 51.7%
Eugene McCarthy (I) 73 1.0%
Other 48 0.7%
TOTAL 7,244
Turnout: 64% Diff (St): 2 Diff (US): 4


1972 President, Jefferson County, IA
CandidateVotesPct
Richard Nixon* (R) 4,628 64.8%
George McGovern (D) 2,362 33.1%
John Schmitz (Amer) 144 2.0%
Other 5 0.1%
TOTAL 7,139
Turnout: 64% Diff (St): 7 Diff (US): 4


1968 President, Jefferson County, IA
CandidateVotesPct
Richard Nixon (R) 4,130 59.5%
Hubert Humphrey (D) 2,411 34.7%
George Wallace (AIP) 377 5.4%
Other 21 0.3%
TOTAL 6,939
Turnout: 69% Diff (St): 7 Diff (US): 16


1964 President, Jefferson County, IA
CandidateVotesPct
Lyndon Johnson* (D) 4,135 59.8%
Barry Goldwater (R) 2,755 39.8%
Other 26 0.4%
TOTAL 6,916
Turnout: 69% Diff (St): 2 Diff (US): 1


1956 President, Jefferson County, IA
CandidateVotesPct
Dwight Eisenhower* (R) 4,807 62.8%
Adlai Stevenson (D) 2,845 37.1%
Other 7 0.1%
TOTAL 7,659
Turnout: 72% Diff (St): 4 Diff (US): 5


1952 President, Jefferson County, IA
CandidateVotesPct
Dwight Eisenhower (R) 5,630 69.1%
Adlai Stevenson (D) 2,470 30.3%
Other 49 0.6%
TOTAL 8,149
Turnout: 77% Diff (St): 5 Diff (US): 14


1948 President, Jefferson County, IA
CandidateVotesPct
Harry Truman* (D) 3,033 42.8%
Thomas Dewey (R) 3,906 55.1%
Henry Wallace (Prog) 29 0.4%
Other 120 1.7%
TOTAL 7,088
Turnout: 67% Diff (St): 8 Diff (US): 10


1944 President, Jefferson County, IA
CandidateVotesPct
Franklin Roosevelt* (D) 2,926 39.8%
Thomas Dewey (R) 4,335 59.0%
Other 83 1.1%
TOTAL 7,344
Turnout: 69% Diff (St): 7 Diff (US): 13


1940 President, Jefferson County, IA
CandidateVotesPct
Franklin Roosevelt* (D) 3,402 40.8%
Wendell Willkie (R) 4,891 58.7%
Other 43 0.5%
TOTAL 8,336
Turnout: 78% Diff (St): 7 Diff (US): 14


1936 President, Jefferson County, IA
CandidateVotesPct
Franklin Roosevelt* (D) 3,690 46.5%
Alf Landon (R) 4,037 50.8%
William Lemke (Union) 189 2.4%
Norman Thomas (Soc) 3 0.0%
Other 22 0.3%
TOTAL 7,941
Turnout: 78% Diff (St): 8 Diff (US): 14


1932 President, Jefferson County, IA
CandidateVotesPct
Franklin Roosevelt (D) 4,056 57.0%
Herbert Hoover* (R) 2,955 41.6%
Norman Thomas (Soc) 52 0.7%
Other 47 0.7%
TOTAL 7,110
Turnout: 69% Diff (St): 2 Diff (US): 2


1928 President, Jefferson County, IA
CandidateVotesPct
Herbert Hoover (R) 4,919 69.5%
Al Smith (D) 2,159 30.5%
TOTAL 7,078
Turnout: 70% Diff (St): 8 Diff (US): 11


1924 President, Jefferson County, IA
CandidateVotesPct
Calvin Coolidge (R) 4,062 61.6%
John Davis (D) 1,249 19.0%
Robert LaFollette (Prog) 1,279 19.4%
TOTAL 6,590
Turnout: 65% Diff (St): 7 Diff (US): 8


1920 President, Jefferson County, IA
CandidateVotesPct
Warren Harding (R) 4,558 74.6%
James Cox (D) 1,450 23.7%
Eugene Debs (Soc) 34 0.6%
Parley Christiansen (FL) 13 0.2%
Aaron Watkins (Proh) 45 0.7%
Other 8 0.1%
TOTAL 6,108
Turnout: 60% Diff (St): 4 Diff (US): 14


1916 President, Jefferson County, IA
CandidateVotesPct
Woodrow Wilson* (D) 1,734 43.7%
Charles Evans Hughes (R) 2,167 54.6%
Allan Benson (Soc) 29 0.7%
James Hanly (Proh) 37 0.9%
Other 1 0.0%
TOTAL 3,968
Turnout: 40% Diff (St): 0 Diff (US): 9


1912 President, Jefferson County, IA
CandidateVotesPct
Woodrow Wilson (D) 1,311 35.8%
Theodore Roosevelt (Prog) 786 21.5%
William Taft* (R) 1,378 37.6%
Eugene Debs (Soc) 72 2.0%
Eugene Chafin (Proh) 115 3.1%
TOTAL 3,662
Turnout: 38% Diff (St): 13 Diff (US): 14


1908 President, Jefferson County, IA
CandidateVotesPct
William Taft (R) 2,271 58.3%
William J. Bryan (D) 1,439 36.9%
Eugene Debs (Soc) 17 0.4%
Eugene Chafin (Proh) 166 4.3%
Thomas Hisgen (I) 1 0.0%
Other 2 0.1%
TOTAL 3,896
Turnout: 42% Diff (St): 3 Diff (US): 7


1904 President, Jefferson County, IA
CandidateVotesPct
Theodore Roosevelt (R) 2,330 62.2%
Alton Parker (D) 1,172 31.3%
Eugene Debs (Soc) 32 0.9%
Silas Swallow (Proh) 194 5.2%
Thomas Watson (Pop) 16 0.4%
TOTAL 3,744
Turnout: 39% Diff (St): -1 Diff (US): 6


1900 President, Jefferson County, IA
CandidateVotesPct
William McKinley* (R) 2,482 58.7%
William J. Bryan (D) 1,612 38.1%
John Woolley (Proh) 118 2.8%
Eugene Debs (Soc) 9 0.2%
Other 5 0.1%
TOTAL 4,226
Turnout: 42% Diff (St): 1 Diff (US): 7
* incumbent

Historical Statewide Election Results for Jefferson County, IA

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

YearTypeTurnout WinnerRunner-Up OtherTotal VotesDiff PSV
2022 S3 52% Charles Grassley* (R) 3,263 50.3% Michael Franken (D) 3,214 49.5% 12 [+] 0.2% 6,489 -6 0.53%
2022 G 53% Kim Reynolds* (R) 3,449 51.8% Deidre DeJear (D) 3,086 46.3% 125 [+] 1.9% 6,660 -6 0.55%
2020 S2 71% Theresa Greenfield (D) 4,547 51.6% Joni Ernst* (R) 4,008 45.5% 253 [+] 2.9% 8,808 -6 0.53%
2018 G 54% Fred Hubbell (D) 3,750 53.0% Kim Reynolds* (R) 3,146 44.5% 180 [+] 2.5% 7,076 -6 0.53%
2016 S3 60% Charles Grassley* (R) 4,094 51.6% Patty Judge (D) 3,447 43.4% 395 [+] 5.0% 7,936 -9 0.51%
2014 S2 47% Bruce Braley (D) 3,237 51.4% Joni Ernst (R) 2,761 43.8% 304 [+] 4.8% 6,302 -8 0.56%
2014 G 47% Terry Branstad* (R) 3,169 50.1% Jack Hatch (D) 2,856 45.2% 296 [+] 4.7% 6,321 -9 0.56%
2010 S3 48% Charles Grassley* (R) 3,429 51.5% Roxanne Conlin (D) 2,987 44.9% 242 [+] 3.6% 6,658 -13 0.60%
2010 G 49% Chet Culver* (D) 3,412 50.7% Terry Branstad (R) 2,949 43.8% 368 [+] 5.5% 6,729 -9 0.60%
2008 S2 62% Tom Harkin* (D) 5,690 67.7% Christopher Reed (R) 2,700 32.1% 10 [+] 0.1% 8,400 -5 0.56%
2006 G 46% Chet Culver (D) 3,418 56.4% Jim Nussle (R) 2,350 38.7% 297 [+] 4.9% 6,065 -6 0.58%
2004 S3 63% Charles Grassley* (R) 4,979 61.6% Arthur Small (D) 2,598 32.1% 505 [+] 6.2% 8,082 -9 0.55%
2002 S2 47% Tom Harkin* (D) 3,119 52.8% Greg Ganske (R) 2,414 40.9% 373 [+] 6.3% 5,906 -3 0.58%
2002 G 48% Doug Gross (R) 2,571 43.0% Tom Vilsack* (D) 2,324 38.9% 1,086 [+] 18.2% 5,981 -2 0.58%
1998 S3 52% Charles Grassley* (R) 3,763 59.0% David Osterberg (D) 1,354 21.2% 1,256 [+] 19.7% 6,373 -9 0.67%
1998 G 52% Tom Vilsack (D) 3,160 49.4% Jim Ross Lightfoot (R) 2,633 41.1% 609 [+] 9.5% 6,402 -5 0.67%
1996 S2 60% Tom Harkin* (D) 2,880 39.3% Jim Ross Lightfoot (R) 2,841 38.8% 1,603 [+] 21.9% 7,324 -8 0.60%
1994 G 46% Terry Branstad* (R) 3,096 54.5% Bonnie Campbell (D) 1,422 25.1% 1,158 [+] 20.4% 5,676 -2 0.57%
1992 S3 69% Charles Grassley* (R) 4,404 52.3% Stuart Zimmerman (Natural Law) 2,453 29.1% 1,559 [+] 18.5% 8,416 -17 0.65%
1990 S2 46% Tom Harkin* (D) 2,962 52.5% Tom Tauke (R) 2,682 47.5% 3 [+] 0.1% 5,647 1 0.57%
1990 G 46% Terry Branstad* (R) 3,728 65.3% Donald Avenson (D) 1,928 33.8% 52 [+] 0.9% 5,708 5 0.58%
1986 S3 34% Charles Grassley* (R) 2,964 70.3% John Roehrick (D) 1,247 29.6% 8 [+] 0.2% 4,219 4 0.47%
1986 G 35% Terry Branstad* (R) 2,547 59.6% Lowell Junkins (D) 1,726 40.4% 3 [+] 0.1% 4,276 8 0.47%
1984 S2 59% Tom Harkin (D) 3,726 51.3% Roger Jepsen* (R) 3,515 48.4% 22 [+] 0.3% 7,263 5 0.56%
1982 G 43% Terry Branstad (R) 3,109 58.7% Roxanne Conlin (D) 2,151 40.6% 38 [+] 0.7% 5,298 6 0.51%
1980 S3 57% Charles Grassley (R) 4,200 59.8% John Culver* (D) 2,743 39.1% 75 [+] 1.1% 7,018 6 0.55%
1978 S2 36% Roger Jepsen (R) 2,489 59.7% Dick Clark* (D) 1,660 39.8% 20 [+] 0.5% 4,169 9 0.51%
1978 G 37% Robert Ray* (R) 2,840 66.4% Jerry Fitzgerald (D) 1,418 33.2% 17 [+] 0.4% 4,275 8 0.51%
1974 S3 40% David Stanley (R) 2,730 60.5% John Culver (D) 1,767 39.1% 18 [+] 0.4% 4,515 13 0.51%
1974 G 40% Robert Ray* (R) 3,022 66.2% James Schaben (D) 1,517 33.3% 23 [+] 0.5% 4,562 8 0.50%
1972 S2 62% Dick Clark (D) 3,576 51.4% Jack Miller* (R) 3,351 48.1% 33 [+] 0.5% 6,960 4 0.58%
1972 G 62% Robert Ray* (R) 4,506 64.5% Paul Franzenburg (D) 2,416 34.6% 68 [+] 1.0% 6,990 6 0.58%
1970 G 44% Robert Ray* (R) 2,742 60.3% Robert Fulton (D) 1,715 37.7% 87 [+] 1.9% 4,544 9 0.57%
1968 S3 67% David Stanley (R) 3,964 59.0% Harold Hughes (D) 2,752 41.0% 3 [+] 0.0% 6,719 9 0.59%
1968 G 66% Robert Ray (R) 4,093 61.6% Paul Franzenburg (D) 2,546 38.3% 2 [+] 0.0% 6,641 8 0.58%
1966 S2 50% Jack Miller* (R) 3,449 69.6% E.B. Smith (D) 1,441 29.1% 66 [+] 1.3% 4,956 9 0.58%
1966 G 50% William Murray (R) 2,770 55.3% Harold Hughes* (D) 2,129 42.5% 106 [+] 2.1% 5,005 11 0.56%
1964 G 67% Harold Hughes* (D) 4,279 64.3% Evan Hultman (R) 2,363 35.5% 14 [+] 0.2% 6,656 4 0.57%
1962 S3 50% Bourke Hickenlooper* (R) 3,036 60.9% E.B. Smith (D) 1,948 39.1% 0 0.0% 4,984 8 0.62%
1962 G 49% Norman Erbe* (R) 2,749 56.3% Harold Hughes (D) 2,133 43.7% 0 0.0% 4,882 9 0.60%
1960 S2 74% Jack Miller (R) 4,393 59.7% Herschel Loveless (D) 2,962 40.3% 0 0.0% 7,355 8 0.59%
1960 G 73% Norman Erbe (R) 4,334 59.2% Edward McManus (D) 2,989 40.8% 0 0.0% 7,323 7 0.59%
*: 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 Jefferson County, IA

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

DateDistrictWinnerRunner-Up OtherTotal Votes
2024-11-05 IA01Christina Bohannan (D) 4,197 51.3% Mariannette Miller-Meeks* (R) 3,955 48.4% 25 0.3% 8,177
County Total for 2024-11-05:   8,177
2022-11-08 IA01Mariannette Miller-Meeks* (R) 3,274 50.5% Christina Bohannan (D) 3,204 49.4% 7 0.1% 6,485
County Total for 2022-11-08:   6,485
2020-11-03 IA02Rita Hart (D) 4,374 50.8% Mariannette Miller-Meeks (R) 4,226 49.0% 17 0.2% 8,617
County Total for 2020-11-03:   8,617
2018-11-06 IA02Dave Loebsack* (D) 4,201 59.8% Christopher Peters (R) 2,644 37.6% 178 2.5% 7,023
County Total for 2018-11-06:   7,023
2016-11-08 IA02Dave Loebsack* (D) 4,572 58.7% Christopher Peters (R) 3,194 41.0% 18 0.2% 7,784
County Total for 2016-11-08:   7,784
2014-11-04 IA02Dave Loebsack* (D) 3,527 56.3% Mariannette Miller-Meeks (R) 2,717 43.4% 19 0.3% 6,263
County Total for 2014-11-04:   6,263
2012-11-06 IA02Dave Loebsack* (D) 4,784 58.4% John Archer (R) 3,281 40.1% 127 1.6% 8,192
County Total for 2012-11-06:   8,192
2010-11-02 IA02Dave Loebsack* (D) 3,397 51.0% Mariannette Miller-Meeks (R) 3,066 46.0% 198 3.0% 6,661
County Total for 2010-11-02:   6,661
2008-11-04 IA02Dave Loebsack* (D) 4,121 49.6% Mariannette Miller-Meeks (R) 3,801 45.8% 384 4.6% 8,306
County Total for 2008-11-04:   8,306
2006-11-07 IA02Jim Leach* (R) 3,165 54.5% Dave Loebsack (D) 2,644 45.5% 2 0.0% 5,811
County Total for 2006-11-07:   5,811
2004-11-02 IA02Jim Leach* (R) 4,843 60.8% Dave Franker (D) 2,891 36.3% 234 2.9% 7,968
County Total for 2004-11-02:   7,968
2002-11-05 IA02Jim Leach* (R) 3,396 57.6% Julie Thomas (D) 2,274 38.5% 230 3.9% 5,900
County Total for 2002-11-05:   5,900
2000-11-07 IA03Leonard Boswell* (D) 3,632 49.3% Jay Marcus (R) 3,261 44.2% 477 6.5% 7,370
County Total for 2000-11-07:   7,370
1998-11-03 IA03Leonard Boswell* (D) 2,707 44.0% Larry McKibben (R) 2,674 43.5% 767 12.5% 6,148
County Total for 1998-11-03:   6,148
1996-11-05 IA03Mike Mahaffey (R) 3,034 42.1% Leonard Boswell (D) 2,006 27.9% 2,161 30.0% 7,201
County Total for 1996-11-05:   7,201
1994-11-08 IA03Jim Ross Lightfoot* (R) 3,094 58.8% Elaine Baxter (D) 2,065 39.3% 101 1.9% 5,260
County Total for 1994-11-08:   5,260
1992-11-03 IA03Jim Ross Lightfoot* (R) 3,236 38.7% Elaine Baxter (D) 2,616 31.3% 2,513 30.0% 8,365
County Total for 1992-11-03:   8,365
*: incumbent           sp: special election           RO: runoff election

Voter Registration Data for Jefferson County, IA

YearTotalRepublicanDemocratOtherR/D EdgeR/D Edge %VAPOP %
2024 8,536 3,276 38.4% 3,117 36.5% 2,143 25.1% Rep +159 Rep +1.9% 64%
2022 9,739 3,486 35.8% 3,832 39.3% 2,421 24.9% Dem +346 Dem +3.6% 78%
2020 10,967 3,569 32.5% 4,542 41.4% 2,856 26.0% Dem +973 Dem +8.9% 88%
2018 10,435 3,208 30.7% 4,211 40.4% 3,016 28.9% Dem +1,003 Dem +9.6% 82%
2016 10,494 3,369 32.1% 3,997 38.1% 3,128 29.8% Dem +628 Dem +6.0% 81%
2014 10,295 3,437 33.4% 3,441 33.4% 3,417 33.2% Dem +4 Dem +0.0% 78%
2012 10,424 3,600 34.5% 3,380 32.4% 3,444 33.0% Rep +220 Rep +2.1% 77%
2010 11,709 3,810 32.5% 3,717 31.7% 4,182 35.7% Rep +93 Rep +0.8% 85%
2008 12,529 3,696 29.5% 4,155 33.2% 4,678 37.3% Dem +459 Dem +3.7% 93%
2006 11,946 3,894 32.6% 3,035 25.4% 5,017 42.0% Rep +859 Rep +7.2% 91%
2004 12,265 4,314 35.2% 2,909 23.7% 5,042 41.1% Rep +1,405 Rep +11.5% 96%
2002 11,571 4,976 43.0% 1,944 16.8% 4,651 40.2% Rep +3,032 Rep +26.2% 92%
2000 11,421 5,419 47.4% 1,895 16.6% 4,107 36.0% Rep +3,524 Rep +30.9% 94%
1994 10,181 3,487 34.3% 2,432 23.9% 4,262 41.9% Rep +1,055 Rep +10.4% 83%
1986 9,060 3,395 37.5% 2,622 28.9% 3,043 33.6% Rep +773 Rep +8.5% 74%
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.