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Seneca County, OH


Micropolitan Statistical Area: Tiffin, OH
Designated Market Area: Toledo, OH-MI
USDA County Type (2025): Manufacturing
American Communities Project County Type (2023): Rural Middle America

Places in Seneca County, OH     [Sort places by name]

 

Tracts in Seneca County, OH

   



Click here to view demographic data for Seneca County, OH

2024 population: 54,730   ( 346 from 2020)
Land area: 551.0 square miles
Population density: 99.3 persons per square mile

2024 Census data
White:47,979 87.66% 2.4%
Black:1,2942.36% 0.9%
Indian:1230.22% 7.9%
Asian:5861.07% 35.0%
2+ races:1,3822.53% 17.7%
Hispanic:3,3666.15% 15.2%
Total non-White:6,75112.34% 13.9%

2020-2024 ComponentsNumberRate
Births:2,531 11.5
Deaths:2,94813.4
Net Migration: -282-1.3
Net Immigration: 3411.5
Change in White population:-1,171 -2.1
Change in Non-White pop.:825 1.5



Historical Presidential Election Results for Seneca County, OH



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

YearTurnout WinnerRunner-Up OtherTotal Votes Diff
(St)
Diff
(US)
PSV
2024 59% Donald Trump (R) 17,241 67.9% Kamala Harris (D) 7,765 30.6% 398 [+] 1.6% 25,404 13 18 0.44%
2020 60% Donald Trump* (R) 17,086 66.1% Joe Biden (D) 8,266 32.0% 496 [+] 1.9% 25,848 13 19 0.44%
2016 56% Donald Trump (R) 14,825 61.3% Hillary Clinton (D) 7,404 30.6% 1,954 [+] 8.1% 24,183 10 15 0.44%
2012 59% Mitt Romney (R) 13,243 52.3% Barack Obama* (D) 11,353 44.8% 747 [+] 2.9% 25,343 5 5 0.45%
2008 63% John McCain (R) 13,823 50.2% Barack Obama (D) 13,087 47.5% 643 [+] 2.3% 27,553 3 5 0.48%
2004 62% George W. Bush* (R) 15,886 58.9% John Kerry (D) 10,957 40.6% 148 [+] 0.5% 26,991 8 8 0.48%
2000 56% George W. Bush (R) 13,863 56.9% Albert Gore, Jr. (D) 9,512 39.1% 976 [+] 4.0% 24,351 7 9 0.52%
1996 54% Bill Clinton* (D) 10,044 42.7% Robert Dole (R) 9,713 41.3% 3,754 [+] 16.0% 23,511 0 1 0.52%
1992 61% George Bush* (R) 9,763 37.3% Bill Clinton (D) 9,280 35.5% 7,107 [+] 27.2% 26,150 -1 0 0.53%
1988 55% George Bush (R) 13,704 58.5% Michael Dukakis (D) 9,504 40.6% 222 [+] 0.9% 23,430 3 5 0.53%
1984 58% Ronald Reagan* (R) 16,520 67.0% Walter Mondale (D) 7,905 32.1% 217 0.9% 24,642 8 8 0.54%
1980 55% Ronald Reagan (R) 14,172 60.9% Jimmy Carter* (D) 7,303 31.4% 1,784 [+] 7.7% 23,259 9 10 0.54%
1976 57% Gerald Ford* (R) 11,730 52.1% Jimmy Carter (D) 10,074 44.7% 712 [+] 3.2% 22,516 3 4 0.55%
1972 59% Richard Nixon* (R) 13,939 60.8% George McGovern (D) 8,180 35.7% 799 [+] 3.5% 22,918 1 0 0.56%
1968 66% Richard Nixon (R) 12,040 52.3% Hubert Humphrey (D) 8,970 39.0% 2,010 [+] 8.7% 23,020 7 9 0.58%
1964 69% Lyndon Johnson* (D) 14,518 60.4% Barry Goldwater (R) 9,536 39.6% 0 0.0% 24,054 3 1 0.61%
1960 75% Richard Nixon (R) 15,772 61.2% John Kennedy (D) 10,001 38.8% 0 0.0% 25,773 8 12 0.62%
1956 67% Dwight Eisenhower* (R) 17,728 73.9% Adlai Stevenson (D) 6,260 26.1% 0 0.0% 23,988 13 17 0.65%
1952 72% Dwight Eisenhower (R) 17,750 71.5% Adlai Stevenson (D) 7,060 28.5% 0 0.0% 24,810 15 16 0.67%
1948 59% Thomas Dewey (R) 11,493 58.9% Harry Truman* (D) 7,954 40.7% 77 [+] 0.4% 19,524 10 14 0.66%
1944 67% Thomas Dewey (R) 15,137 70.9% Franklin Roosevelt* (D) 6,224 29.1% 0 0.0% 21,361 21 25 0.68%
1940 77% Wendell Willkie (R) 16,272 68.6% Franklin Roosevelt* (D) 7,464 31.4% 0 0.0% 23,736 21 24 0.71%
1936 77% Alf Landon (R) 9,953 44.7% Franklin Roosevelt* (D) 8,982 40.4% 3,324 [+] 14.9% 22,259 7 8 0.74%
1932 74% Franklin Roosevelt (D) 11,894 55.9% Herbert Hoover* (R) 9,007 42.3% 383 [+] 1.8% 21,284 -5 3 0.82%
1928 78% Herbert Hoover (R) 13,369 61.9% Al Smith (D) 8,136 37.7% 82 [+] 0.4% 21,587 -3 4 0.86%
1924 68% Calvin Coolidge (R) 9,641 53.3% John Davis (D) 6,290 34.8% 2,160 [+] 11.9% 18,091 -5 -1 0.90%
1920 72% Warren Harding (R) 10,064 54.4% James Cox (D) 8,175 44.2% 261 [+] 1.4% 18,500 -4 -6 0.92%
1916 45% Woodrow Wilson* (D) 6,451 57.8% Charles Evans Hughes (R) 4,301 38.5% 409 [+] 3.7% 11,161 -6 -8 0.96%
1912 41% Woodrow Wilson (D) 5,082 49.6% William Taft* (R) 2,362 23.1% 2,796 [+] 27.3% 10,240 -4 0 0.99%
1908 49% William J. Bryan (D) 6,138 53.3% William Taft (R) 4,959 43.1% 415 [+] 3.6% 11,512 -8 -9 1.03%
1904 45% Theodore Roosevelt (R) 5,291 50.8% Alton Parker (D) 4,757 45.7% 372 [+] 3.6% 10,420 -9 -6 1.04%
1900 49% William J. Bryan (D) 5,946 53.6% William McKinley* (R) 4,904 44.2% 240 [+] 2.2% 11,090 -8 -7 1.07%
* incumbent         PSV: percent of state vote

Historical Statewide Election Results for Seneca County, OH

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

YearTypeTurnout WinnerRunner-Up OtherTotal VotesDiff PSV
2024 S1 59% Bernie Moreno (R) 15,420 61.5% Sherrod Brown* (D) 8,509 33.9% 1,163 [+] 4.6% 25,092 11 0.44%
2022 S3 42% J.D. Vance (R) 11,618 64.7% Tim Ryan (D) 6,322 35.2% 18 [+] 0.1% 17,958 12 0.43%
2022 G 42% Mike DeWine* (R) 13,667 75.7% Nan Whaley (D) 4,319 23.9% 58 [+] 0.3% 18,044 13 0.44%
2018 S1 44% Jim Renacci (R) 9,945 53.2% Sherrod Brown* (D) 8,741 46.8% 6 [+] 0.0% 18,692 7 0.42%
2018 G 44% Mike DeWine (R) 11,521 61.4% Richard Cordray (D) 6,457 34.4% 772 [+] 4.1% 18,750 11 0.42%
2016 S3 55% Rob Portman* (R) 16,097 68.4% Ted Strickland (D) 6,154 26.2% 1,279 [+] 5.4% 23,530 10 0.44%
2014 G 32% John Kasich* (R) 9,662 70.1% Edward FitzGerald (D) 3,722 27.0% 394 [+] 2.9% 13,778 6 0.45%
2012 S1 58% Josh Mandel (R) 12,802 51.1% Sherrod Brown* (D) 10,525 42.0% 1,703 [+] 6.8% 25,030 6 0.46%
2010 S3 41% Rob Portman (R) 11,069 62.5% Lee Fisher (D) 5,732 32.4% 915 [+] 5.2% 17,716 6 0.46%
2010 G 41% John Kasich (R) 8,716 49.4% Ted Strickland* (D) 7,790 44.1% 1,155 [+] 6.5% 17,661 0 0.46%
2006 S1 46% Sherrod Brown (D) 10,742 53.5% Mike DeWine* (R) 9,343 46.5% 1 [+] 0.0% 20,086 3 0.50%
2006 G 46% Ted Strickland (D) 11,387 56.8% Kenneth Blackwell (R) 8,011 40.0% 653 [+] 3.3% 20,051 3 0.50%
2004 S3 61% George Voinovich* (R) 18,913 71.8% Eric Fingerhut (D) 7,439 28.2% 0 0.0% 26,352 8 0.49%
2002 G 38% Bob Taft III* (R) 11,101 66.8% Tim Hagan (D) 4,780 28.8% 735 [+] 4.4% 16,616 9 0.51%
2000 S1 55% Mike DeWine* (R) 16,045 67.4% Ted Celeste (D) 6,732 28.3% 1,032 [+] 4.3% 23,809 7 0.53%
1998 S3 43% George Voinovich (R) 11,525 61.6% Mary Boyle (D) 7,195 38.4% 0 0.0% 18,720 5 0.55%
1998 G 42% Bob Taft III (R) 9,637 53.3% Lee Fisher (D) 7,156 39.5% 1,303 [+] 7.2% 18,096 3 0.54%
1994 S1 44% Mike DeWine (R) 10,889 57.7% Joel Hyatt (D) 6,488 34.4% 1,500 [+] 7.9% 18,877 4 0.55%
1994 G 43% George Voinovich* (R) 13,994 75.9% Robert Burch (D) 3,717 20.2% 719 [+] 3.9% 18,430 4 0.55%
1992 S3 60% John Glenn* (D) 12,165 47.2% Mike DeWine (R) 11,020 42.8% 2,568 [+] 10.0% 25,753 1 0.54%
1990 G 44% George Voinovich (R) 11,280 59.9% Anthony Celebrezze (D) 7,537 40.1% 0 0.0% 18,817 4 0.54%
1988 S1 55% Howard Metzenbaum* (D) 12,199 52.2% George Voinovich (R) 11,177 47.8% 0 0.0% 23,376 5 0.54%
1986 S3 43% John Glenn* (D) 10,088 55.6% Thomas Kindness (R) 8,046 44.4% 0 0.0% 18,134 7 0.58%
1986 G 41% Richard Celeste* (D) 10,061 57.8% James Rhodes (R) 7,339 42.2% 0 0.0% 17,400 3 0.57%
1982 S1 44% Paul Pfeifer (R) 10,849 58.4% Howard Metzenbaum* (D) 7,453 40.1% 281 [+] 1.5% 18,583 17 0.55%
1982 G 42% Richard Celeste (D) 9,033 50.2% Clarence Brown, Jr. (R) 8,585 47.7% 381 [+] 2.1% 17,999 9 0.54%
1980 S3 54% John Glenn* (D) 11,403 49.9% James Betts (R) 10,983 48.0% 478 [+] 2.1% 22,864 20 0.57%
1978 G 40% James Rhodes* (R) 8,684 54.7% Richard Celeste (D) 6,691 42.2% 497 [+] 3.1% 15,872 5 0.56%
1976 S1 56% Robert Taft, Jr.* (R) 12,133 54.5% Howard Metzenbaum (D) 9,247 41.5% 896 [+] 4.0% 22,276 8 0.57%
1974 S3 45% John Glenn (D) 11,153 63.7% Ralph Perk (R) 5,497 31.4% 853 [+] 4.9% 17,503 1 0.59%
1974 G 45% James Rhodes (R) 9,702 54.4% John Gilligan* (D) 7,218 40.5% 901 [+] 5.1% 17,821 6 0.58%
1970 S1 48% Robert Taft, Jr. (R) 9,843 56.1% Howard Metzenbaum (D) 7,290 41.6% 409 [+] 2.3% 17,542 6 0.56%
1970 G 49% Roger Cloud (R) 8,936 50.2% John Gilligan (D) 8,533 48.0% 321 [+] 1.8% 17,790 7 0.56%
1968 S3 64% William Saxbe (R) 11,623 51.9% John Gilligan (D) 10,777 48.1% 0 0.0% 22,400 0 0.60%
1966 G 52% James Rhodes* (R) 11,823 65.4% Frazier Reams, Jr. (D) 6,243 34.6% 0 0.0% 18,066 3 0.63%
1964 S1 68% Robert Taft, Jr. (R) 12,871 54.6% Stephen Young* (D) 10,690 45.4% 0 0.0% 23,561 5 0.62%
1962 S3 54% Frank Lausche* (D) 10,652 57.4% John Briley (R) 7,896 42.6% 0 0.0% 18,548 4 0.62%
1962 G 55% James Rhodes (R) 12,902 68.4% Michael DiSalle* (D) 5,968 31.6% 0 0.0% 18,870 9 0.61%
*: 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 Seneca County, OH

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

DateDistrictWinnerRunner-Up OtherTotal Votes
2024-11-05 OH05Bob Latta* (R) 18,361 73.9% Keith Mundy (D) 6,495 26.1% 0 0.0% 24,856
County Total for 2024-11-05:   24,856
2022-11-08 OH05Bob Latta* (R) 13,354 73.3% Craig Swartz (D) 4,855 26.7% 0 0.0% 18,209
County Total for 2022-11-08:   18,209
2020-11-03 OH04Jim Jordan* (R) 17,115 67.1% Shannon Freshour (D) 7,548 29.6% 838 3.3% 25,501
County Total for 2020-11-03:   25,501
2018-11-06 OH04Jim Jordan* (R) 12,041 64.9% Janet Garrett (D) 6,515 35.1% 0 0.0% 18,556
County Total for 2018-11-06:   18,556
2016-11-08 OH04Jim Jordan* (R) 15,214 66.3% Janet Garrett (D) 7,722 33.7% 0 0.0% 22,936
County Total for 2016-11-08:   22,936
2014-11-04 OH04Jim Jordan* (R) 9,031 66.3% Janet Garrett (D) 4,587 33.7% 0 0.0% 13,618
County Total for 2014-11-04:   13,618
2012-11-06 OH04Jim Jordan* (R) 12,639 53.7% Jim Slone (D) 9,306 39.5% 1,605 6.8% 23,550
County Total for 2012-11-06:   23,550
2010-11-02 OH05Bob Latta* (R) 11,726 66.2% Caleb Finkenbiner (D) 4,710 26.6% 1,288 7.3% 17,724
County Total for 2010-11-02:   17,724
2008-11-04 OH05Bob Latta* (R) 16,431 62.4% George Mays (D) 9,909 37.6% 0 0.0% 26,340
County Total for 2008-11-04:   26,340
2007-12-11 sp OH05Bob Latta (R) 5,390 53.3% Robin Weirauch (D) 4,701 46.5% 22 0.2% 10,113
County Total for 2007-12-11:   10,113
2006-11-07 OH05Paul Gillmor* (R) 12,103 59.6% Robin Weirauch (D) 8,204 40.4% 0 0.0% 20,307
County Total for 2006-11-07:   20,307
2004-11-02 OH05Paul Gillmor* (R) 17,888 68.9% Robin Weirauch (D) 8,062 31.1% 0 0.0% 25,950
County Total for 2004-11-02:   25,950
2002-11-05 OH05Paul Gillmor* (R) 11,415 67.8% Roger Anderson (D) 4,586 27.2% 837 5.0% 16,838
County Total for 2002-11-05:   16,838
2000-11-07 OH05Paul Gillmor* (R) 17,682 74.2% Dannie Edmon (D) 4,991 21.0% 1,146 4.8% 23,819
County Total for 2000-11-07:   23,819
1996-11-05 OH05Paul Gillmor* (R) 14,650 62.6% Annie Saunders (D) 7,580 32.4% 1,156 4.9% 23,386
County Total for 1996-11-05:   23,386
1994-11-08 OH05Paul Gillmor* (R) 14,120 74.9% Jarrod Tudor (D) 4,722 25.1% 0 0.0% 18,842
County Total for 1994-11-08:   18,842
*: incumbent           sp: special election           RO: runoff election

Voter Registration Data for Seneca County, OH

Party registration is not used in this state, however as of 2022 registrations in Seneca County, OH were estimated to be 42% Republican and 19% Democrat.

YearTotalRepublicanDemocratOtherR/D EdgeR/D Edge %VAPOP %
2024 35,068 0 0.0% 0 0.0% 35,068 100.0% n/a n/a 82%
2022 34,328 0 0.0% 0 0.0% 34,328 100.0% n/a n/a 80%
2020 34,413 0 0.0% 0 0.0% 34,413 100.0% n/a n/a 80%
2018 34,681 0 0.0% 0 0.0% 34,681 100.0% n/a n/a 81%
2016 34,399 0 0.0% 0 0.0% 34,399 100.0% n/a n/a 80%
2014 35,193 0 0.0% 0 0.0% 35,193 100.0% n/a n/a 82%
2012 36,320 0 0.0% 0 0.0% 36,320 100.0% n/a n/a 84%
2010 37,148 0 0.0% 0 0.0% 37,148 100.0% n/a n/a 86%
2008 36,440 0 0.0% 0 0.0% 36,440 100.0% n/a n/a 84%
2006 35,027 0 0.0% 0 0.0% 35,027 100.0% n/a n/a 81%
2004 37,974 0 0.0% 0 0.0% 37,974 100.0% n/a n/a 87%
2002 35,713 0 0.0% 0 0.0% 35,713 100.0% n/a n/a 82%
2000 35,917 0 0.0% 0 0.0% 35,917 100.0% n/a n/a 83%
1998 35,543 0 0.0% 0 0.0% 35,543 100.0% n/a n/a 82%
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.