The following table indicates the party of elected officials in the U.S. state of Ohio:
- Governor
- Lieutenant Governor
- Attorney General
- Secretary of State
- State Treasurer
- State Auditor
The table also indicates the historical party composition in the:
- State Senate
- State House of Representatives
- State Supreme Court
- State delegation to the U.S. Senate
- State delegation to the U.S. House of Representatives
For years in which a presidential election was held, the table indicates which party's nominees received the state's electoral votes. Also indicated is the party that controlled the Ohio Apportionment Board, which draws legislative districts for the Ohio General Assembly in the years following the United States Census.
1788–1845
{| class="wikitable sortable sticky-header-multi" style="text-align:center"
!rowspan=2 class=unsortable |Year!! colspan=4 |Executive offices!!colspan=2|State Legislature!! rowspan=2 class=unsortable |Ohio<br/>Supreme<br/>Court!!colspan=3|United States Congress!!rowspan=2 class=unsortable |Electoral votes
|- style="height:2em"
! class=unsortable |Governor!! class=unsortable |Secretary of State!! class=unsortable |Treasurer!! class=unsortable |Auditor!! class=unsortable |Senate!! class=unsortable |House!! class=unsortable |Senator<br/>(Class I)!! class=unsortable |Senator<br/>(Class III)!! class=unsortable |House
|- style="height:2em"
!1788
|rowspan=15 |Arthur St. Clair <small>(F)</small>
|rowspan=11 |Winthrop Sargent <small>(F)</small>
|
|
|
|
|
|
|
|
|rowspan=16|
|- style="height:2em"
!1789
|- style="height:2em"
!1790
|- style="height:2em"
!1791
|- style="height:2em"
!1792
|- style="height:2em"
!1793
|- style="height:2em"
!1794
|- style="height:2em"
!1795
|- style="height:2em"
!1796
|rowspan=7 |John Armstrong <small>(F)</small>
|- style="height:2em"
!1797
|- style="height:2em"
!1798
|- style="height:2em"
!1799
||William Henry Harrison <small>(F)</small>
|- style="height:2em"
!1800
|rowspan=3 |Charles Willing Byrd <small>(DR)</small>
|- style="height:2em"
!1801
|- style="height:2em"
!1802
|- style="height:2em"
!1803
|rowspan=4 |Edward Tiffin <small>(DR)</small>
|rowspan=5 |William Creighton Jr. <small>(DR)</small>
|rowspan=13 |William McFarland <small>(DR)</small>
|rowspan=5 |Thomas Gibson <small>(DR)</small>
| rowspan=23 |DR maj.
| rowspan=23 |DR maj.
| rowspan=5 |3DR
|rowspan=5 |John Smith <small>(DR)</small>
|rowspan=4 |Thomas Worthington <small>(DR)</small>
|rowspan=10 |1DR
|- style="height:2em"
!1804
|rowspan=4 |Thomas Jefferson/<br/>George Clinton <small>(DR)</small>
|- style="height:2em"
!1805
|- style="height:2em"
!1806
|- style="height:2em"
!1807
||Thomas Kirker <small>(DR)</small>
|rowspan=2 |Edward Tiffin <small>(DR)</small>
|- style="height:2em"
!1808
|rowspan=2 |Samuel Huntington <small>(DR)</small>
|rowspan=24 |Jeremiah McLene <small>(DR)</small>
|rowspan=7 |Benjamin Hough <small>(DR)</small>
| rowspan=3 |4DR
| |vacant
| rowspan=4 |James Madison/<br/>George Clinton <small>(DR)</small>
|- style="height:2em"
!1809
| rowspan=2 |Return J. Meigs Jr. <small>(DR)</small>
||Stanley Griswold <small>(DR)</small>
|- style="height:2em"
!1810
|rowspan=4 |Return J. Meigs Jr. <small>(DR)</small>
|rowspan=4 |Alexander Campbell <small>(DR)</small>
|- style="height:2em"
!1811
| rowspan=5 |3DR
| rowspan=4 |Thomas Worthington <small>(DR)</small>
|- style="height:2em"
!1812
| rowspan=4 |James Madison/<br/>Elbridge Gerry <small>(DR)</small>
|- style="height:2em"
!1813
|rowspan=11 |6DR
|- style="height:2em"
!1814
| |Othniel Looker <small>(DR)</small>
|rowspan=5 |Jeremiah Morrow <small>(DR)</small>
|- style="height:2em"
!1815
| rowspan=3 |Thomas Worthington <small>(DR)</small>
|rowspan=19 |Ralph Osborn <small>(DR)</small>
||Joseph Kerr <small>(DR)</small>
|- style="height:2em"
!1816
| rowspan=4 |Hiram M. Curry <small>(DR)</small>
| rowspan=10 |4DR
| rowspan=10 |Benjamin Ruggles <small>(DR)</small>
|rowspan=9 |James Monroe/<br/>Daniel D. Tompkins <small>(DR)</small>
|- style="height:2em"
!1817
|- style="height:2em"
!1818
|rowspan=4 |Ethan Allen Brown <small>(DR)</small>
|- style="height:2em"
!1819
|rowspan=3 |William A. Trimble <small>(DR)</small>
|- style="height:2em"
!1820
|rowspan=4 |Samuel Sullivan <small>(DR)</small>
|- style="height:2em"
!1821
|- style="height:2em"
!rowspan=2|1822
||Allen Trimble <small>(F)</small>
|rowspan=4 |Ethan Allen Brown <small>(DR)</small>
|- style="height:2em"
|rowspan=4 |Jeremiah Morrow <small>(DR)</small>
|- style="height:2em"
!1823
|rowspan=12 |Henry Brown <small>(DR)</small>
|rowspan=2 |10NR, 2J, 2DR
|- style="height:2em"
!1824
| rowspan=4 |Henry Clay/<br/>Nathan Sanford <small>(DR)</small>
|- style="height:2em"
!1825
|
|
| rowspan=5 |4NR
| rowspan=8 |Benjamin Ruggles <small>(NR)</small>
|rowspan=3 |William Henry Harrison <small>(NR)</small>
|rowspan=2 |12NR, 2J
|- style="height:2em"
!1826
|rowspan=4 |Allen Trimble <small>(NR)</small>
|
|
|- style="height:2em"
!1827
|
|
|rowspan=2 |12NR, 2J
|- style="height:2em"
!1828
||22NR, 13J
||44NR, 28J
|rowspan=4 |Jacob Burnet <small>(NR)</small>
|rowspan=4 | Andrew Jackson/<br/>John C. Calhoun <small>(D)</small>
|- style="height:2em"
!1829
||19NR, 17J
||38NR, 34J
|rowspan=2 |8J, 6NR
|- style="height:2em"
!1830
|rowspan=2 |Duncan McArthur <small>(NR)</small>
||21J, 15NR
||37J, 32NR, 3?
||2NR, 2J
|- style="height:2em"
!1831
| rowspan=4 |Moses H. Kirby <small>(NR)</small>
||18D, 18W
||38NR, 29D,
| rowspan=2 |3NR, 1J
|rowspan=2 |8NR, 6J
|- style="height:2em"
!1832
|rowspan=4 |Robert Lucas <small>(D)</small>
||20NR, 16D
||42NR, 30D
|rowspan=5 |Thomas Ewing <small>(NR)</small>
|rowspan=4 |Andrew Jackson/<br/>Martin Van Buren <small>(D)</small>
|- style="height:2em"
!1833
|rowspan=6 |John A. Bryan <small>(D)</small>
||19D, 17W
||39D, 31W, 2?
| rowspan=2 |2NR, 2D
| rowspan=4 |Thomas Morris <small>(J)</small>
|rowspan=2 |11D, 6NR,
|- style="height:2em"
!1834
||22D, 14NR
||46D, 26NR
|- style="height:2em"
!1835
||Benjamin B. Hinkson <small>(D)</small>
| rowspan=12 |Joseph Whitehill <small>(W)</small>
||19D, 17W
||42W, 29D, 1?
||3W, 1D
|rowspan=2 |9D, 9W,
|- style="height:2em"
!1836
|rowspan=2 |Joseph Vance <small>(W)</small>
|rowspan=4 |Carter B. Harlan <small>(D)</small>
||20D, 16W
||46D, 26W
| rowspan=6 |2D, 2W
|rowspan=4 |William Henry Harrison/<br/>Francis Granger <small>(W)</small>
|- style="height:2em"
!1837
||20W, 16D
||37D, 35W
| rowspan=2 |Thomas Morris <small>(D)</small>
| rowspan=10 |William Allen <small>(D)</small>
|rowspan=2 |11W, 8D
|- style="height:2em"
!1838
|rowspan=2 |Wilson Shannon <small>(D)</small>
||20W, 16D
||40W, 32D
|- style="height:2em"
!1839
|rowspan=7 |John Brough <small>(D)</small>
||19D, 17W
||38D, 34W
| rowspan=8 |Benjamin Tappan <small>(D)</small>
|rowspan=2 |11D, 8W
|- style="height:2em"
!1840
|rowspan=2 |Thomas Corwin <small>(W)</small>
||William Trevitt <small>(D)</small>
||25D, 11W
||48D, 24W
| rowspan=4 |William Henry Harrison/<br/>John Tyler <small>(W)</small>
|- style="height:2em"
!1841
|rowspan=3 |John Sloane <small>(W)</small>
||22D, 14W
||51W, 21D
|rowspan=2 |12W, 7D
|- style="height:2em"
!1842
|rowspan=2 |Wilson Shannon <small>(D)</small>
||19D, 17W
||37D, 35W
| rowspan=5 |3D, 1W
|- style="height:2em"
!1843
||22D, 14W
||39D, 33W
|rowspan=3 |12D, 9W
|- style="height:2em"
!rowspan=2|1844
||Thomas W. Bartley <small>(D)</small>
| rowspan=3 |Samuel Galloway <small>(W)</small>
|rowspan=2 |20D, 16W
|rowspan=2 |38W, 34D
| rowspan=3 |Henry Clay/<br/>Theodore Frelinghuysen <small>(W)</small>
|- style="height:2em"
|rowspan=2 |Mordecai Bartley <small>(W)</small>
|- style="height:2em"
!1845
| |John Woods <small>(W)</small>
||22W, 14D
||41W, 31D
| |13D, 8W
|}
1846–present
{| class="wikitable sortable sticky-header-multi" style="text-align:center"
!rowspan=2 class=unsortable |Year!!colspan=6|Executive offices!!colspan=2|State Legislature!! rowspan=2 class=unsortable |Ohio<br/>Supreme<br/>Court!!colspan=3|United States Congress!!rowspan=2 class=unsortable |Electoral votes
|- style="height:2em"
! class=unsortable |Governor!! class=unsortable |Lt. Governor!! class=unsortable |Attorney General!! class=unsortable |Secretary of State!! class=unsortable |Treasurer!! class=unsortable |Auditor!! class=unsortable |Senate!! class=unsortable |House!! class=unsortable |Senator<br/>(Class I)!! class=unsortable |Senator<br/>(Class III)!! class=unsortable |House
|- style="height:2em"
!1846
|rowspan=3 |William Bebb <small>(W)</small>
| rowspan=6 |no such<br/>office
|rowspan=5 |Henry Stanbery <small>(W)</small>
| rowspan=4 |Samuel Galloway <small>(W)</small>
||Joseph Whitehill <small>(W)</small>
| rowspan=6 |John Woods <small>(W)</small>
||21W, 15D
||44W, 28D
||3D, 1W
|rowspan=4 |Thomas Corwin <small>(W)</small>
| rowspan=4 |William Allen <small>(D)</small>
||13D, 8W
| rowspan=2 |
|- style="height:2em"
!1847
|rowspan=5 |Albert A. Bliss <small>(W)</small>
||18D, 18W
||39W, 32D, 1I
|rowspan=4 |2D, 2W
|rowspan=2 |11W, 10D
|- style="height:2em"
!1848
||19W, 17D
||40W, 32D
|rowspan=4 |Cass/<br/>Butler <small>(D)</small>
|- style="height:2em"
!1849
||Seabury Ford <small>(W)</small>
||18W, 18D
||37W, 35D
|rowspan=2 |11D, 8W, 2FS
|- style="height:2em"
!1850
|rowspan=3 |Reuben Wood <small>(D)</small>
|rowspan=2 |Henry W. King <small>(FS)</small>
||16W, 16D, 4FS
||36W, 29D, 7FS
||Thomas Ewing <small>(W)</small>
|rowspan=6 |Salmon P. Chase <small>(FS)</small>
|- style="height:2em"
!1851
||Joseph McCormick <small>(D)</small>
||17W, 16D, 3FS
||34W, 32D, 6FS