RightDataUSA

Jefferson County, WI


Micropolitan Statistical Area: Watertown-Fort Atkinson, WI
Designated Market Area: Milwaukee, WI
USDA County Type (2015): Manufacturing
American Communities Project County Type (2023): Rural Middle America

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

 

Tracts in Jefferson County, WI

   



Click here to view demographic data for Jefferson County, WI

2022 population: 85,784   ( 2,098 from 2010 , 367 from 2020)
Land area: 556.5 square miles
Population density: 154.2 persons per square mile

2022 Census data
White:76,005 88.60% 0.1%
Black:9251.08% 47.3%
Indian:2750.32% 29.7%
Asian:8240.96% 46.1%
2+ races:1,1361.32% 48.1%
Hispanic:6,6197.72% 19.2%
Total non-White:9,77911.40% 25.6%

2020-2022 ComponentsNumberRate
Births:1,839 10.7
Deaths:1,93411.2
Net Migration: -302-1.8
Net Immigration: 230.1
Change in White population:102 0.1
Change in Non-White pop.:1,996 2.4



Historical Presidential Election Results for Jefferson County, WI

Recent Trends
VotesΔ MarginSwing %
2024 vs. 2020 R +1,563 R +893 R + 1.1%
D +670
2024 vs. 2016 R +5,354 R +1,349 D + 0.5%
D +4,005
2020 vs. 2016 R +3,791 R +456 D + 1.6%
D +3,335
2024 vs. 2012 R +5,254 R +4,838 R + 8.9%
D +416
2016 vs. 2008 R +2,321 R +7,200 R + 18.0%
D -4,879
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 75% Donald Trump (R) 28,771 57.4% Kamala Harris (D) 20,574 41.0% 801 [+] 1.6% 50,146 8 8 1.47%
2020 71% Donald Trump* (R) 27,208 56.7% Joe Biden (D) 19,904 41.5% 867 [+] 1.8% 47,979 8 10 1.45%
2016 66% Donald Trump (R) 23,417 54.3% Hillary Clinton (D) 16,569 38.4% 3,123 [+] 7.2% 43,109 7 8 1.45%
2012 69% Mitt Romney (R) 23,517 53.1% Barack Obama* (D) 20,158 45.5% 606 [+] 1.4% 44,281 7 6 1.44%
2008 69% Barack Obama (D) 21,448 49.7% John McCain (R) 21,096 48.9% 622 [+] 1.4% 43,166 7 3 1.45%
2004 72% George W. Bush* (R) 23,776 56.5% John Kerry (D) 17,925 42.6% 414 [+] 1.0% 42,115 7 6 1.41%
2000 65% George W. Bush (R) 19,204 53.2% Albert Gore, Jr. (D) 15,203 42.1% 1,692 [+] 4.7% 36,099 6 5 1.39%
1996 56% Bill Clinton* (D) 13,188 44.3% Robert Dole (R) 12,681 42.6% 3,905 [+] 13.1% 29,774 4 2 1.36%
1992 64% George Bush* (R) 13,072 39.9% Bill Clinton (D) 11,593 35.3% 8,137 [+] 24.8% 32,802 3 2 1.30%
1988 53% George Bush (R) 14,309 54.3% Michael Dukakis (D) 11,816 44.9% 217 [+] 0.8% 26,342 7 1 1.20%
1984 59% Ronald Reagan* (R) 17,780 61.8% Walter Mondale (D) 10,788 37.5% 216 0.8% 28,784 8 3 1.30%
1980 64% Ronald Reagan (R) 16,174 53.9% Jimmy Carter* (D) 11,335 37.8% 2,491 [+] 8.3% 30,000 6 3 1.32%
1976 68% Gerald Ford* (R) 15,528 53.9% Jimmy Carter (D) 12,577 43.7% 707 [+] 2.5% 28,812 6 6 1.37%
1972 61% Richard Nixon* (R) 14,621 59.5% George McGovern (D) 9,303 37.8% 663 [+] 2.7% 24,587 6 -1 1.33%
1968 65% Richard Nixon (R) 12,478 54.9% Hubert Humphrey (D) 8,716 38.4% 1,532 [+] 6.7% 22,726 7 12 1.34%
1964 68% Lyndon Johnson* (D) 13,295 60.2% Barry Goldwater (R) 8,741 39.6% 48 0.2% 22,084 2 1 1.31%
1960 77% Richard Nixon (R) 14,133 61.6% John Kennedy (D) 8,757 38.2% 39 0.2% 22,929 10 12 1.33%
1956 66% Dwight Eisenhower* (R) 13,357 67.0% Adlai Stevenson (D) 6,452 32.4% 122 0.6% 19,931 5 10 1.29%
1952 73% Dwight Eisenhower (R) 13,884 66.9% Adlai Stevenson (D) 6,827 32.9% 32 0.2% 20,743 6 12 1.29%
1948 58% Thomas Dewey (R) 8,244 52.4% Harry Truman* (D) 7,256 46.1% 228 [+] 1.4% 15,728 6 7 1.23%
1944 67% Thomas Dewey (R) 10,245 59.2% Franklin Roosevelt* (D) 6,988 40.4% 84 0.5% 17,317 9 13 1.29%
1940 73% Wendell Willkie (R) 10,178 56.0% Franklin Roosevelt* (D) 7,842 43.2% 149 0.8% 18,169 8 11 1.29%
1936 76% Franklin Roosevelt* (D) 11,144 64.3% Alf Landon (R) 5,599 32.3% 581 [+] 3.4% 17,324 2 -4 1.38%
1932 74% Franklin Roosevelt (D) 11,230 68.3% Herbert Hoover* (R) 5,062 30.8% 156 [+] 0.9% 16,448 0 -9 1.48%
1928 71% Herbert Hoover (R) 8,612 57.3% Al Smith (D) 6,305 41.9% 116 [+] 0.8% 15,033 4 -1 1.48%
1924 66% Robert LaFollette (Prog) 7,885 57.9% Calvin Coolidge (R) 4,250 31.2% 1,476 [+] 10.8% 13,611 -6 -23 1.62%
1920 55% Warren Harding (R) 8,865 80.4% James Cox (D) 1,844 16.7% 320 [+] 2.9% 11,029 9 20 1.57%
1916 39% Charles Evans Hughes (R) 3,785 49.6% Woodrow Wilson* (D) 3,645 47.7% 206 [+] 2.7% 7,636 0 3 1.71%
1912 36% Woodrow Wilson (D) 4,381 62.4% William Taft* (R) 1,926 27.4% 714 [+] 10.2% 7,021 -5 4 1.76%
1908 43% William J. Bryan (D) 4,492 56.6% William Taft (R) 3,207 40.4% 233 [+] 2.9% 7,932 -14 -11 1.75%
1904 42% Alton Parker (D) 3,778 49.1% Theodore Roosevelt (R) 3,669 47.7% 249 [+] 3.2% 7,696 -16 -9 1.74%
1900 44% William J. Bryan (D) 4,127 51.2% William McKinley* (R) 3,729 46.2% 207 [+] 2.6% 8,063 -14 -5 1.82%
* incumbent         PSV: percent of state vote



2020 President, Jefferson County, WI
CandidateVotesPct
Joe Biden (D) 19,904 41.5%
Donald Trump* (R) 27,208 56.7%
Jo Jorgensen (Lbt) 634 1.3%
Other 233 0.5%
TOTAL 47,979
Turnout: 71% Diff (St): 8 Diff (US): 10


2016 President, Jefferson County, WI
CandidateVotesPct
Hillary Clinton (D) 16,569 38.4%
Donald Trump (R) 23,417 54.3%
Gary Johnson (Lbt) 1,662 3.9%
Jill Stein (Grn) 461 1.1%
Evan McMullin (I) 322 0.7%
Other 678 1.6%
TOTAL 43,109
Turnout: 66% Diff (St): 7 Diff (US): 8


2012 President, Jefferson County, WI
CandidateVotesPct
Barack Obama* (D) 20,158 45.5%
Mitt Romney (R) 23,517 53.1%
Gary Johnson (Lbt) 303 0.7%
Other 303 0.7%
TOTAL 44,281
Turnout: 69% Diff (St): 7 Diff (US): 6


2008 President, Jefferson County, WI
CandidateVotesPct
Barack Obama (D) 21,448 49.7%
John McCain (R) 21,096 48.9%
Ralph Nader (I) 231 0.5%
Bob Barr (Lbt) 140 0.3%
Other 251 0.6%
TOTAL 43,166
Turnout: 69% Diff (St): 7 Diff (US): 3


2004 President, Jefferson County, WI
CandidateVotesPct
George W. Bush* (R) 23,776 56.5%
John Kerry (D) 17,925 42.6%
Ralph Nader (I) 240 0.6%
Other 174 0.4%
TOTAL 42,115
Turnout: 72% Diff (St): 7 Diff (US): 6


2000 President, Jefferson County, WI
CandidateVotesPct
George W. Bush (R) 19,204 53.2%
Albert Gore, Jr. (D) 15,203 42.1%
Ralph Nader (Grn) 1,361 3.8%
Pat Buchanan (Ref) 130 0.4%
Other 201 0.6%
TOTAL 36,099
Turnout: 65% Diff (St): 6 Diff (US): 5


1996 President, Jefferson County, WI
CandidateVotesPct
Bill Clinton* (D) 13,188 44.3%
Robert Dole (R) 12,681 42.6%
Ross Perot (Ref) 3,177 10.7%
Ralph Nader (Grn) 328 1.1%
Harry Browne (Lbt) 96 0.3%
Other 304 1.0%
TOTAL 29,774
Turnout: 56% Diff (St): 4 Diff (US): 2


1992 President, Jefferson County, WI
CandidateVotesPct
Bill Clinton (D) 11,593 35.3%
George Bush* (R) 13,072 39.9%
Ross Perot (I) 7,960 24.3%
Other 177 0.5%
TOTAL 32,802
Turnout: 64% Diff (St): 3 Diff (US): 2


1988 President, Jefferson County, WI
CandidateVotesPct
George Bush (R) 14,309 54.3%
Michael Dukakis (D) 11,816 44.9%
Ron Paul (Lbt) 74 0.3%
Other 143 0.5%
TOTAL 26,342
Turnout: 53% Diff (St): 7 Diff (US): 1


1984 President, Jefferson County, WI
CandidateVotesPct
Ronald Reagan* (R) 17,780 61.8%
Walter Mondale (D) 10,788 37.5%
Other 216 0.8%
TOTAL 28,784
Turnout: 59% Diff (St): 8 Diff (US): 3


1980 President, Jefferson County, WI
CandidateVotesPct
Ronald Reagan (R) 16,174 53.9%
Jimmy Carter* (D) 11,335 37.8%
John Anderson (I) 1,925 6.4%
Edward Clark (Lbt) 446 1.5%
Other 120 0.4%
TOTAL 30,000
Turnout: 64% Diff (St): 6 Diff (US): 3


1976 President, Jefferson County, WI
CandidateVotesPct
Jimmy Carter (D) 12,577 43.7%
Gerald Ford* (R) 15,528 53.9%
Eugene McCarthy (I) 454 1.6%
Other 253 0.9%
TOTAL 28,812
Turnout: 68% Diff (St): 6 Diff (US): 6


1972 President, Jefferson County, WI
CandidateVotesPct
Richard Nixon* (R) 14,621 59.5%
George McGovern (D) 9,303 37.8%
John Schmitz (Amer) 611 2.5%
Other 52 0.2%
TOTAL 24,587
Turnout: 61% Diff (St): 6 Diff (US): -1


1968 President, Jefferson County, WI
CandidateVotesPct
Richard Nixon (R) 12,478 54.9%
Hubert Humphrey (D) 8,716 38.4%
George Wallace (AIP) 1,470 6.5%
Other 62 0.3%
TOTAL 22,726
Turnout: 65% Diff (St): 7 Diff (US): 12


1964 President, Jefferson County, WI
CandidateVotesPct
Lyndon Johnson* (D) 13,295 60.2%
Barry Goldwater (R) 8,741 39.6%
Other 48 0.2%
TOTAL 22,084
Turnout: 68% Diff (St): 2 Diff (US): 1


1960 President, Jefferson County, WI
CandidateVotesPct
John Kennedy (D) 8,757 38.2%
Richard Nixon (R) 14,133 61.6%
Other 39 0.2%
TOTAL 22,929
Turnout: 77% Diff (St): 10 Diff (US): 12


1956 President, Jefferson County, WI
CandidateVotesPct
Dwight Eisenhower* (R) 13,357 67.0%
Adlai Stevenson (D) 6,452 32.4%
Other 122 0.6%
TOTAL 19,931
Turnout: 66% Diff (St): 5 Diff (US): 10


1952 President, Jefferson County, WI
CandidateVotesPct
Dwight Eisenhower (R) 13,884 66.9%
Adlai Stevenson (D) 6,827 32.9%
Other 32 0.2%
TOTAL 20,743
Turnout: 73% Diff (St): 6 Diff (US): 12


1948 President, Jefferson County, WI
CandidateVotesPct
Harry Truman* (D) 7,256 46.1%
Thomas Dewey (R) 8,244 52.4%
Henry Wallace (Prog) 151 1.0%
Other 77 0.5%
TOTAL 15,728
Turnout: 58% Diff (St): 6 Diff (US): 7


1944 President, Jefferson County, WI
CandidateVotesPct
Franklin Roosevelt* (D) 6,988 40.4%
Thomas Dewey (R) 10,245 59.2%
Other 84 0.5%
TOTAL 17,317
Turnout: 67% Diff (St): 9 Diff (US): 13


1940 President, Jefferson County, WI
CandidateVotesPct
Franklin Roosevelt* (D) 7,842 43.2%
Wendell Willkie (R) 10,178 56.0%
Other 149 0.8%
TOTAL 18,169
Turnout: 73% Diff (St): 8 Diff (US): 11


1936 President, Jefferson County, WI
CandidateVotesPct
Franklin Roosevelt* (D) 11,144 64.3%
Alf Landon (R) 5,599 32.3%
William Lemke (Union) 524 3.0%
Norman Thomas (Soc) 40 0.2%
Other 17 0.1%
TOTAL 17,324
Turnout: 76% Diff (St): 2 Diff (US): -4


1932 President, Jefferson County, WI
CandidateVotesPct
Franklin Roosevelt (D) 11,230 68.3%
Herbert Hoover* (R) 5,062 30.8%
Norman Thomas (Soc) 117 0.7%
Other 39 0.2%
TOTAL 16,448
Turnout: 74% Diff (St): 0 Diff (US): -9


1928 President, Jefferson County, WI
CandidateVotesPct
Herbert Hoover (R) 8,612 57.3%
Al Smith (D) 6,305 41.9%
Norman Thomas (Soc) 76 0.5%
Other 40 0.3%
TOTAL 15,033
Turnout: 71% Diff (St): 4 Diff (US): -1


1924 President, Jefferson County, WI
CandidateVotesPct
Calvin Coolidge (R) 4,250 31.2%
John Davis (D) 1,374 10.1%
Robert LaFollette (Prog) 7,885 57.9%
Other 102 0.7%
TOTAL 13,611
Turnout: 66% Diff (St): -6 Diff (US): -23


1920 President, Jefferson County, WI
CandidateVotesPct
Warren Harding (R) 8,865 80.4%
James Cox (D) 1,844 16.7%
Eugene Debs (Soc) 203 1.8%
Aaron Watkins (Proh) 117 1.1%
TOTAL 11,029
Turnout: 55% Diff (St): 9 Diff (US): 20


1916 President, Jefferson County, WI
CandidateVotesPct
Woodrow Wilson* (D) 3,645 47.7%
Charles Evans Hughes (R) 3,785 49.6%
Allan Benson (Soc) 86 1.1%
James Hanly (Proh) 120 1.6%
TOTAL 7,636
Turnout: 39% Diff (St): 0 Diff (US): 3


1912 President, Jefferson County, WI
CandidateVotesPct
Woodrow Wilson (D) 4,381 62.4%
Theodore Roosevelt (Prog) 490 7.0%
William Taft* (R) 1,926 27.4%
Eugene Debs (Soc) 100 1.4%
Eugene Chafin (Proh) 121 1.7%
Other 3 0.0%
TOTAL 7,021
Turnout: 36% Diff (St): -5 Diff (US): 4


1908 President, Jefferson County, WI
CandidateVotesPct
William Taft (R) 3,207 40.4%
William J. Bryan (D) 4,492 56.6%
Eugene Debs (Soc) 70 0.9%
Eugene Chafin (Proh) 161 2.0%
Other 2 0.0%
TOTAL 7,932
Turnout: 43% Diff (St): -14 Diff (US): -11


1904 President, Jefferson County, WI
CandidateVotesPct
Theodore Roosevelt (R) 3,669 47.7%
Alton Parker (D) 3,778 49.1%
Eugene Debs (Soc) 99 1.3%
Silas Swallow (Proh) 147 1.9%
Thomas Watson (Pop) 2 0.0%
Other 1 0.0%
TOTAL 7,696
Turnout: 42% Diff (St): -16 Diff (US): -9


1900 President, Jefferson County, WI
CandidateVotesPct
William McKinley* (R) 3,729 46.2%
William J. Bryan (D) 4,127 51.2%
John Woolley (Proh) 199 2.5%
Eugene Debs (Soc) 8 0.1%
TOTAL 8,063
Turnout: 44% Diff (St): -14 Diff (US): -5
* incumbent

Historical Statewide Election Results for Jefferson County, WI

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

YearTypeTurnout WinnerRunner-Up OtherTotal VotesDiff PSV
2024 S1 73% Eric Hovde (R) 28,005 56.9% Tammy Baldwin* (D) 20,631 41.9% 622 [+] 1.3% 49,258 8 1.45%
2022 S3 57% Ron Johnson* (R) 22,402 58.0% Mandela Barnes (D) 16,141 41.8% 64 [+] 0.2% 38,607 8 1.46%
2022 G 58% Tim Michels (R) 21,488 55.5% Tony Evers* (D) 16,765 43.3% 479 [+] 1.2% 38,732 8 1.46%
2018 S1 57% Leah Vukmir (R) 19,809 52.3% Tammy Baldwin* (D) 18,055 47.6% 47 [+] 0.1% 37,911 8 1.42%
2018 G 58% Scott Walker* (R) 21,475 56.3% Tony Evers (D) 16,018 42.0% 664 [+] 1.7% 38,157 8 1.43%
2016 S3 65% Ron Johnson* (R) 23,902 56.5% Russ Feingold (D) 17,149 40.5% 1,283 [+] 3.0% 42,334 6 1.44%
2014 G 55% Scott Walker* (R) 21,443 60.0% Mary Burke (D) 13,876 38.8% 443 [+] 1.2% 35,762 8 1.48%
2012 S1 68% Tommy Thompson (R) 23,393 53.8% Tammy Baldwin (D) 19,081 43.9% 1,040 [+] 2.4% 43,514 8 1.45%
2012 G 58% Scott Walker* (R) 22,475 60.0% Tom Barrett (D) 14,698 39.2% 305 [+] 0.8% 37,478 7 1.49%
2010 S3 50% Ron Johnson (R) 18,801 59.5% Russ Feingold* (D) 12,344 39.1% 459 [+] 1.5% 31,604 8 1.46%
2010 G 49% Scott Walker (R) 19,155 60.8% Tom Barrett (D) 11,909 37.8% 466 [+] 1.5% 31,530 9 1.46%
2006 S1 51% Herb Kohl* (D) 18,511 60.2% Robert Lorge (R) 11,161 36.3% 1,060 [+] 3.4% 30,732 7 1.44%
2006 G 51% Mark Green (R) 16,038 51.8% Jim Doyle* (D) 14,247 46.0% 680 [+] 2.2% 30,965 6 1.43%
2004 S3 71% Tim Michels (R) 21,725 52.2% Russ Feingold* (D) 19,684 47.3% 217 [+] 0.5% 41,626 8 1.41%
2002 G 44% Scott McCallum* (R) 11,237 44.7% Jim Doyle (D) 9,243 36.8% 4,662 [+] 18.5% 25,142 3 1.42%
2000 S1 64% Herb Kohl* (D) 19,284 54.2% John Gillespie (R) 15,800 44.4% 498 [+] 1.4% 35,582 7 1.40%
1998 S3 44% Mark Neumann (R) 13,081 55.4% Russ Feingold* (D) 10,236 43.3% 314 [+] 1.3% 23,631 7 1.34%
1998 G 43% Tommy Thompson* (R) 15,363 65.3% Ed Garvey (D) 7,647 32.5% 529 [+] 2.2% 23,539 6 1.34%
1994 S1 38% Herb Kohl* (D) 10,577 53.7% Robert Welch (R) 8,898 45.2% 208 [+] 1.1% 19,683 5 1.26%
1994 G 37% Tommy Thompson* (R) 13,779 70.3% Chuck Chavala (D) 5,369 27.4% 445 [+] 2.3% 19,593 3 1.25%
1992 S3 64% Bob Kasten* (R) 16,315 49.9% Russ Feingold (D) 15,852 48.4% 555 [+] 1.7% 32,722 4 1.33%
1990 G 34% Tommy Thompson* (R) 10,646 62.8% Thomas Loftus (D) 6,305 37.2% 5 [+] 0.0% 16,956 5 1.23%
1988 S1 53% Susan Engeleiter (R) 13,852 52.1% Herb Kohl (D) 12,632 47.5% 91 [+] 0.3% 26,575 5 1.23%
1986 S3 39% Bob Kasten* (R) 10,767 56.4% Ed Garvey (D) 8,089 42.4% 235 [+] 1.2% 19,091 6 1.29%
1986 G 40% Tommy Thompson (R) 11,551 59.0% Anthony Earl* (D) 7,876 40.2% 159 [+] 0.8% 19,586 6 1.28%
1982 S1 40% William Proxmire* (D) 11,154 58.0% Scott McCallum (R) 7,774 40.4% 316 [+] 1.6% 19,244 6 1.25%
1982 G 41% Anthony Earl (D) 9,862 49.8% Terry Kohler (R) 9,629 48.6% 309 [+] 1.6% 19,800 7 1.25%
1980 S3 62% Bob Kasten (R) 17,516 60.0% Gaylord Nelson* (D) 11,441 39.2% 241 [+] 0.8% 29,198 10 1.32%
1978 G 49% Lee Dreyfus (R) 12,255 58.6% Martin Schreiber* (D) 8,519 40.7% 141 [+] 0.7% 20,915 4 1.39%
1976 S1 61% William Proxmire* (D) 16,891 65.3% Stanley York (R) 8,889 34.4% 94 [+] 0.4% 25,874 7 1.34%
1974 S3 42% Gaylord Nelson* (D) 10,504 60.0% Tom Petri (R) 6,771 38.7% 223 [+] 1.3% 17,498 3 1.46%
1974 G 43% William Dyke (R) 9,498 53.6% Patrick Lucey* (D) 7,770 43.9% 441 [+] 2.5% 17,709 12 1.50%
1970 S1 52% William Proxmire* (D) 13,042 68.2% John Erickson (R) 5,984 31.3% 84 [+] 0.4% 19,110 3 1.43%
1970 G 52% Jack Olson (R) 10,047 52.4% Patrick Lucey (D) 9,034 47.1% 108 [+] 0.6% 19,189 7 1.43%
1968 S3 64% Gaylord Nelson* (D) 13,038 59.1% Jerris Leonard (R) 9,036 40.9% 0 0.0% 22,074 3 1.33%
1968 G 65% Warren Knowles* (R) 12,749 56.6% Bronson LaFollette (D) 9,722 43.2% 36 [+] 0.2% 22,507 4 1.33%
1966 G 44% Warren Knowles* (R) 8,969 60.8% Patrick Lucey (D) 5,720 38.8% 57 [+] 0.4% 14,746 7 1.26%
1964 S1 68% Wilbur Renk (R) 12,046 54.8% William Proxmire* (D) 9,934 45.2% 15 [+] 0.1% 21,995 8 1.31%
1964 G 69% Warren Knowles (R) 12,561 56.5% John Reynolds* (D) 9,650 43.4% 2 [+] 0.0% 22,213 6 1.31%
1962 S3 52% Alexander Wiley* (R) 9,171 56.3% Gaylord Nelson (D) 7,102 43.6% 16 [+] 0.1% 16,289 9 1.29%
1962 G 52% Philip Kuehn (R) 9,259 56.9% John Reynolds (D) 7,004 43.0% 15 [+] 0.1% 16,278 7 1.29%
1960 G 77% Philip Kuehn (R) 12,781 55.7% Gaylord Nelson* (D) 10,146 44.3% 0 0.0% 22,927 7 1.33%
*: 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, WI

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

DateDistrictWinnerRunner-Up OtherTotal Votes
2024-11-05 WI05Scott Fitzgerald* (R) 29,580 60.7% Ben Steinhoff (D) 19,092 39.2% 61 0.1% 48,733
County Total for 2024-11-05:   48,733
2022-11-08 WI05Scott Fitzgerald* (R) 22,642 59.2% Mike Van Someren (D) 15,557 40.7% 26 0.1% 38,225
County Total for 2022-11-08:   38,225
2020-11-03 WI05Scott Fitzgerald (R) 27,605 58.8% Tom Palzewicz (D) 19,282 41.1% 46 0.1% 46,933
County Total for 2020-11-03:   46,933
2018-11-06 WI05James Sensenbrenner* (R) 21,760 58.0% Tom Palzewicz (D) 15,702 41.9% 25 0.1% 37,487
County Total for 2018-11-06:   37,487
2016-11-08 WI05James Sensenbrenner* (R) 25,438 61.7% Khary Penebaker (D) 13,758 33.4% 2,012 4.9% 41,208
County Total for 2016-11-08:   41,208
2014-11-04 WI05James Sensenbrenner* (R) 21,856 63.3% Chris Rockwood (D) 12,631 36.6% 58 0.2% 34,545
County Total for 2014-11-04:   34,545
2012-11-06 WI05James Sensenbrenner* (R) 25,237 61.6% Dave Heaster (D) 15,310 37.4% 413 1.0% 40,960
County Total for 2012-11-06:   40,960
2010-11-02 WI02Chad Lee (R) 9,405 52.2% Tammy Baldwin* (D) 8,581 47.7% 19 0.1% 18,005
2010-11-02 WI05James Sensenbrenner* (R) 3,627 69.3% Todd Kolosso (D) 1,090 20.8% 517 9.9% 5,234
2010-11-02 WI06Tom Petri* (R) 5,766 74.3% Joseph Kallas (D) 1,983 25.5% 16 0.2% 7,765
County Total for 2010-11-02:   31,004
2008-11-04 WI02Tammy Baldwin* (D) 14,472 59.1% Peter Theron (R) 9,957 40.7% 64 0.3% 24,493
2008-11-04 WI05James Sensenbrenner* (R) 4,679 81.2% Robert Raymond (I) 1,070 18.6% 11 0.2% 5,760
2008-11-04 WI06Tom Petri* (R) 6,531 66.5% Roger Kittelson (D) 3,241 33.0% 47 0.5% 9,819
County Total for 2008-11-04:   40,072
2006-11-07 WI02Dave Magnum (R) 9,037 50.0% Tammy Baldwin* (D) 9,029 49.9% 18 0.1% 18,084
2006-11-07 WI05James Sensenbrenner* (R) 3,130 62.9% Bryan Kennedy (D) 1,667 33.5% 182 3.7% 4,979
2006-11-07 WI06Tom Petri* (R) 5,660 99.1% 53 0.9% 5,713
County Total for 2006-11-07:   28,776
2004-11-02 WI02Tammy Baldwin* (D) 12,426 51.1% Dave Magnum (R) 11,882 48.9% 12 0.0% 24,320
2004-11-02 WI05James Sensenbrenner* (R) 4,376 65.8% Bryan Kennedy (D) 2,127 32.0% 143 2.2% 6,646
2004-11-02 WI06Tom Petri* (R) 6,550 67.8% Jeff Hall (D) 2,774 28.7% 333 3.4% 9,657
County Total for 2004-11-02:   40,623
2002-11-05 WI02Tammy Baldwin* (D) 7,976 53.3% Ron Greer (R) 6,964 46.5% 24 0.2% 14,964
2002-11-05 WI05James Sensenbrenner* (R) 2,916 83.8% Robert Raymond (I) 555 16.0% 7 0.2% 3,478
2002-11-05 WI06Tom Petri* (R) 4,533 99.4% 28 0.6% 4,561
County Total for 2002-11-05:   23,003
2000-11-07 WI01Paul Ryan* (R) 1,169 67.8% Jeffrey Thomas (D) 548 31.8% 8 0.5% 1,725
2000-11-07 WI02John Sharpless (R) 625 55.7% Tammy Baldwin* (D) 492 43.9% 5 0.4% 1,122
2000-11-07 WI09James Sensenbrenner* (R) 21,927 68.7% Mike Clawson (D) 9,907 31.0% 87 0.3% 31,921
County Total for 2000-11-07:   34,768
1998-11-03 WI01Paul Ryan (R) 526 60.7% Lydia Spottswood (D) 338 39.0% 2 0.2% 866
1998-11-03 WI02Josephine Musser (R) 343 52.9% Tammy Baldwin (D) 304 46.8% 2 0.3% 649
1998-11-03 WI09James Sensenbrenner* (R) 16,099 89.2% Jeffrey Gonyo (I) 1,943 10.8% 3 0.0% 18,045
County Total for 1998-11-03:   19,560
1996-11-05 WI01Mark Neumann* (R) 796 53.7% Lydia Spottswood (D) 687 46.3% 0 0.0% 1,483
1996-11-05 WI02Scott Klug* (R) 562 62.2% Paul Soglin (D) 331 36.6% 11 1.2% 904
1996-11-05 WI09James Sensenbrenner* (R) 17,932 68.1% Floyd Brenholt (D) 8,382 31.9% 0 0.0% 26,314
County Total for 1996-11-05:   28,701
1994-11-08 WI01Mark Neumann (R) 427 56.6% Peter Barca* (D) 299 39.7% 28 3.7% 754
1994-11-08 WI02Scott Klug* (R) 433 76.1% Thomas Hecht (D) 118 20.7% 18 3.2% 569
1994-11-08 WI09James Sensenbrenner* (R) 13,459 100.0% 0 0.0% 13,459
County Total for 1994-11-08:   14,782
1993-05-04 sp WI01Mark Neumann (R) 136 56.9% Peter Barca (D) 100 41.8% 3 1.3% 239
County Total for 1993-05-04:   239
1992-11-03 WI01Les Aspin* (D) 825 52.3% Mark Neumann (R) 717 45.5% 34 2.2% 1,576
1992-11-03 WI02Scott Klug* (R) 564 64.5% Ada Deer (D) 300 34.3% 11 1.3% 875
1992-11-03 WI09James Sensenbrenner* (R) 18,441 65.1% Ingrid Buxton (D) 8,996 31.8% 878 3.1% 28,315
County Total for 1992-11-03:   30,766
*: incumbent           sp: special election           RO: runoff election

Voter Registration Data for Jefferson County, WI

Party registration is not used in this state, however as of 2022 registrations in Jefferson County, WI were estimated to be 43% Republican and 22% Democrat.

YearTotalRepublicanDemocratOtherR/D EdgeR/D Edge %VAPOP %
2024 52,186 0 0.0% 0 0.0% 52,186 100.0% n/a n/a 80%
2022 50,658 0 0.0% 0 0.0% 50,658 100.0% n/a n/a 75%
2020 52,395 0 0.0% 0 0.0% 52,395 100.0% n/a n/a 78%
2018 46,316 0 0.0% 0 0.0% 46,316 100.0% n/a n/a 70%
2016 50,796 0 0.0% 0 0.0% 50,796 100.0% n/a n/a 77%
2014 50,126 0 0.0% 0 0.0% 50,126 100.0% n/a n/a 77%
2012 51,165 0 0.0% 0 0.0% 51,165 100.0% n/a n/a 79%
2010 50,195 0 0.0% 0 0.0% 50,195 100.0% n/a n/a 79%
2008 49,800 0 0.0% 0 0.0% 49,800 100.0% n/a n/a 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.