Ohio was admitted to the Union on March 1, 1803, and elects U.S. senators to class 1 and class 3. Its current U.S. senators are Republicans Bernie Moreno and Jon Husted (both serving since 2025). John Sherman was Ohio's longest-serving senator (1861–1877; 1881–1897).
List of senators
|- style="height:2em" ! rowspan=3 | 1 | rowspan=3 align=left | John Smith | rowspan=3 | Democratic-Republican | rowspan=3 nowrap | Apr 1, 1803 –Apr 25, 1808 | rowspan=3 | Elected in 1803.Resigned. | rowspan=5 | 1 | | rowspan=2 | 1 | rowspan=2 | Elected in 1803.Retired. | rowspan=2 nowrap | Apr 1, 1803 –Mar 3, 1807 | rowspan=2 | Democratic-Republican | rowspan=2 align=right | Thomas Worthington ! rowspan=2 | 1
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|- style="height:2em" | | rowspan=9 | 2 | rowspan=3 | Elected in 1807., citing Taylor, William A. Ohio Statesmen and Annals of Progress: From the year 1788 to the year 1900. Columbus, OH: Press of the Westbote, 1899. 50.Resigned. | rowspan=3 nowrap | Mar 4, 1807 –Mar 3, 1809 | rowspan=3 | Democratic-Republican | rowspan=3 align=right | Edward Tiffin ! rowspan=3 | 2
|- style="height:2em" | colspan=3 | Vacant | nowrap | Apr 25, 1808 –Dec 12, 1808
|- style="height:2em" ! rowspan=3 | 2 | rowspan=3 align=left | Return J. Meigs Jr. | rowspan=3 | Democratic-Republican | rowspan=3 nowrap | Dec 12, 1808 –Dec 8, 1810 | Elected in 1808 to finish Smith's term.
|- style="height:2em" | rowspan=2 | Elected in 1808 to full term.Resigned to become Governor of Ohio. | rowspan=9 | 2
| nowrap | Mar 4, 1809 –May 18, 1809 | colspan=3 | Vacant
|- style="height:2em" | rowspan=2 | Appointed to continue Tiffin's term.Retired when successor elected. | rowspan=2 nowrap | May 18, 1809 –Dec 11, 1809 | rowspan=2 | Democratic-Republican | rowspan=2 align=right | Stanley Griswold ! rowspan=2 | 3
|- style="height:2em" | rowspan=2 colspan=3 | Vacant | rowspan=2 nowrap | Dec 8, 1810 –Dec 15, 1810 | rowspan=2 |
|- style="height:2em" | rowspan=3 | Elected in 1809 to finish Tiffin's term.Retired. | rowspan=3 nowrap | Dec 11, 1809 –Mar 3, 1813 | rowspan=3 | Democratic-Republican | rowspan=3 align=right | Alexander Campbell ! rowspan=3 | 4
|- style="height:2em" ! rowspan=3 | 3 | rowspan=3 align=left | Thomas Worthington | rowspan=3 | Democratic-Republican | rowspan=3 nowrap | Dec 15, 1810 –Dec 1, 1814 | rowspan=3 | Elected in 1810 to finish Meigs's term.Resigned to become Governor of Ohio.
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|- style="height:2em" | | rowspan=5 | 3 | rowspan=5 | Elected in 1813.Retired. | rowspan=5 nowrap | Mar 4, 1813 –Mar 3, 1819 | rowspan=5 | Democratic-Republican | rowspan=5 align=right | Jeremiah Morrow ! rowspan=5 | 5
|- style="height:2em" | colspan=3 | Vacant | nowrap | Dec 1, 1814 –Dec 10, 1814
|- style="height:2em" ! 4 | align=left | Joseph Kerr | | Democratic-Republican | nowrap | Dec 10, 1814 –Mar 3, 1815 | Elected in 1814 to finish Meigs's term.Retired.
|- style="height:2em" ! rowspan=13 | 5 | rowspan=13 align=left | Benjamin Ruggles | rowspan=7 | Democratic-Republican | rowspan=13 nowrap | Mar 4, 1815 –Mar 3, 1833 | rowspan=3 | Elected in 1815. | rowspan=3 | 3
|- style="height:2em"
|- style="height:2em" | | rowspan=5 | 4 | rowspan=2 | Elected in 1819.Died. | rowspan=2 nowrap | Mar 4, 1819 –Dec 13, 1821 | rowspan=2 | Democratic-Republican | rowspan=2 align=right | William A. Trimble ! rowspan=2 | 6
|- style="height:2em" | rowspan=5 | Re-elected in 1821. | rowspan=5 | 4
|- style="height:2em"
| nowrap | Dec 13, 1821 –Jan 3, 1822 | colspan=3 | Vacant
|- style="height:2em" | rowspan=2 | Elected in 1822 to finish Trimble's term.Lost re-election. | rowspan=2 nowrap | Jan 3, 1822 –Mar 3, 1825 | rowspan=2 | Democratic-Republican | rowspan=2 align=right | Ethan Allen Brown ! rowspan=2 | 7
|- style="height:2em"
|- style="height:2em" | rowspan=6 | NationalRepublican | | rowspan=5 | 5 | rowspan=2 | Elected in 1824.Resigned to become U.S. Minister to Colombia. | rowspan=2 nowrap | Mar 4, 1825 –May 20, 1828 | rowspan=2 | NationalRepublican | rowspan=2 align=right | William Henry Harrison ! rowspan=2 | 8
|- style="height:2em" | rowspan=5 | Re-elected in 1827.Retired. | rowspan=5 | 5
|- style="height:2em"
| nowrap | May 20, 1828 –Dec 10, 1828 | colspan=3 | Vacant
|- style="height:2em" | rowspan=2 | Elected in 1828 to finish Harrison's term.Retired. | rowspan=2 nowrap | Dec 10, 1828 –Mar 3, 1831 | rowspan=2 | NationalRepublican | rowspan=2 align=right | Jacob Burnet ! rowspan=2 | 9
|- style="height:2em"
|- style="height:2em" | | rowspan=3 | 6 | rowspan=3 | Elected in 1830.Lost re-election. | rowspan=3 nowrap | Mar 4, 1831 –Mar 3, 1837 | rowspan=3 | NationalRepublican | rowspan=3 align=right | Thomas Ewing ! rowspan=3 | 10
|- style="height:2em" ! rowspan=3 | 6 | rowspan=3 align=left | Thomas Morris | rowspan=2 | Jacksonian | rowspan=3 nowrap | Mar 4, 1833 –Mar 3, 1839 | rowspan=3 | Elected in 1833.Lost re-election. | rowspan=3 | 6
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|- style="height:2em" | | Democratic | | rowspan=3 | 7 | rowspan=3 | Elected in 1837. | rowspan=6 nowrap | Mar 4, 1837 –Mar 3, 1849 | rowspan=6 | Democratic | rowspan=6 align=right | William Allen ! rowspan=6 | 11
|- style="height:2em" ! rowspan=3 | 7 | rowspan=3 align=left | Benjamin Tappan | rowspan=3 | Democratic | rowspan=3 nowrap | Mar 4, 1839 –Mar 3, 1845 | rowspan=3 | Elected in 1838.Retired. | rowspan=3 | 7
|- style="height:2em"
|- style="height:2em" | | rowspan=3 | 8 | rowspan=3 | Re-elected in 1842.Lost re-election.
|- style="height:2em" ! rowspan=3 | 8 | rowspan=3 align=left | Thomas Corwin | rowspan=3 | Whig | rowspan=3 nowrap | Mar 4, 1845 –Jul 20, 1850 | rowspan=3 | Elected in 1844.Resigned to become U.S. Secretary of the Treasury. | rowspan=4 | 8
|- style="height:2em"
|- style="height:2em" | | rowspan=5 | 9 | rowspan=5 | Elected in 1849.Retired. | rowspan=5 nowrap | Mar 4, 1849 –Mar 3, 1855 | rowspan=5 | Free Soil | rowspan=5 align=right | Salmon P. Chase ! rowspan=5 | 12
|- style="height:2em" ! 9 | align=left | Thomas Ewing | | Whig | nowrap | Jul 20, 1850 –Mar 3, 1851 | Appointed to finish Corwin's term.Lost election to the next term.
|- style="height:2em" | colspan=3 | Vacant | nowrap | Mar 4, 1851 –Mar 15, 1851
| rowspan=4 | 9
|- style="height:2em" ! rowspan=11 | 10 | rowspan=11 align=left | Benjamin Wade | rowspan=2 | Whig | rowspan=11 nowrap | Mar 15, 1851 –Mar 3, 1869 | rowspan=3 | Elected late in 1851.
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|- style="height:2em" | rowspan=9 | Republican | | rowspan=3 | 10 | rowspan=3 | Elected in 1854Lost re-election. | rowspan=3 nowrap | Mar 4, 1855 –Mar 3, 1861 | rowspan=3 | Democratic | rowspan=3 align=right | George E. Pugh ! rowspan=3 | 13
|- style="height:2em" | rowspan=5 | Re-elected in 1856. | rowspan=5 | 10
|- style="height:2em"
|- style="height:2em" | | rowspan=5 | 11 | Elected in 1860.Resigned to become U.S. Secretary of the Treasury. | nowrap | Mar 4, 1861 –Mar 6, 1861 | | Republican | align=right | Salmon P. Chase ! 14
|- style="height:2em"
| nowrap | Mar 6, 1861 –Mar 21, 1861 | colspan=3 | Vacant
|- style="height:2em" | rowspan=3 | Elected in 1861 to finish Chase's term. | rowspan=9 nowrap | Mar 21, 1861 –Mar 8, 1877 | rowspan=9 | Republican | rowspan=9 align=right | John Sherman ! rowspan=9 | 15
|- style="height:2em" | rowspan=3 | Re-elected in 1863.Lost renomination. | rowspan=3 | 11
|- style="height:2em"
|- style="height:2em" | | rowspan=3 | 12 | rowspan=3 | Re-elected in 1866.
|- style="height:2em" ! rowspan=8 | 11 | rowspan=8 align=left | Allen G. Thurman | rowspan=8 | Democratic | rowspan=8 nowrap | Mar 4, 1869 –Mar 3, 1881 | rowspan=3 | Elected in 1868. | rowspan=3 | 12
|- style="height:2em"
|- style="height:2em" | | rowspan=5 | 13 | rowspan=3 | Re-elected in 1872.Resigned to become U.S. Secretary of the Treasury.
|- style="height:2em" | rowspan=5 | Re-elected in 1874.Lost re-election. | rowspan=5 | 13
|- style="height:2em"
|- style="height:2em"
| nowrap | Mar 8, 1877 –Mar 21, 1877 | colspan=3 | Vacant
|- style="height:2em" | Elected in 1877 to finish Sherman's term.Retired. | nowrap | Mar 21, 1877 –Mar 3, 1879 | | Republican | align=right | Stanley Matthews ! 16
|- style="height:2em" | | rowspan=3 | 14 | rowspan=3 | Election date unknown.Lost renomination. | rowspan=3 nowrap | Mar 4, 1879 –Mar 3, 1885 | rowspan=3 | Democratic | rowspan=3 align=right | George H. Pendleton ! rowspan=3 | 17
|- style="height:2em" ! rowspan=9 | 12 | rowspan=9 align=left | John Sherman | rowspan=9 | Republican | rowspan=9 nowrap | Mar 4, 1881 –Mar 4, 1897 | rowspan=3 | Elected in 1881. | rowspan=3 | 14
|- style="height:2em"
|- style="height:2em" | | rowspan=3 | 15 | rowspan=3 | Elected in 1884.Retired. | rowspan=3 nowrap | Mar 4, 1885 –Mar 3, 1891 | rowspan=3 | Democratic | rowspan=3 align=right | Henry B. Payne ! rowspan=3 | 18
|- style="height:2em" | rowspan=3 | Re-elected in 1886. | rowspan=3 | 15
|- style="height:2em"
|- style="height:2em" | | rowspan=3 | 16 | rowspan=3 | Elected in 1890.Lost re-election. | rowspan=3 nowrap | Mar 4, 1891 –Mar 3, 1897 | rowspan=3 | Democratic | rowspan=3 align=right | Calvin S. Brice ! rowspan=3 | 19
|- style="height:2em" | rowspan=3 | Re-elected in 1892.Resigned to become U.S. Secretary of State. | rowspan=4 | 16
|- style="height:2em"
|- style="height:2em" | | rowspan=4 | 17 | rowspan=4 | Elected in 1896. | rowspan=9 nowrap | Mar 4, 1897 –Mar 3, 1909 | rowspan=9 | Republican | rowspan=9 align=right | Joseph B. Foraker ! rowspan=9 | 20
|- style="height:2em" ! rowspan=4 | 13 | rowspan=4 align=left | Mark Hanna | rowspan=4 | Republican | rowspan=4 nowrap | Mar 5, 1897 –Feb 15, 1904 | Appointed to continue Sherman's term.Elected in 1898 to finish Sherman's term.
|- style="height:2em" | rowspan=3 | Elected in 1898 to the next term.Died. | rowspan=5 | 17
|- style="height:2em"
|- style="height:2em" | | rowspan=5 | 18 | rowspan=5 | Re-elected in 1902.Retired.
|- style="height:2em" | colspan=3 | Vacant | nowrap | Feb 15, 1904 –Mar 23, 1904
|- style="height:2em" ! rowspan=4 | 14 | rowspan=4 align=left | Charles W. F. Dick | rowspan=4 | Republican | rowspan=4 nowrap | Mar 23, 1904 –Mar 3, 1911 | Elected in 1904 to finish Hanna's term.
|- style="height:2em" | rowspan=3 | Elected in 1904 to the next term.Lost re-election. | rowspan=3 | 18
|- style="height:2em"
|- style="height:2em" | | rowspan=3 | 19 | rowspan=3 | Elected Jan 12, 1909.Retired. | rowspan=3 nowrap | Mar 4, 1909 –Mar 3, 1915 | rowspan=3 | Republican | rowspan=3 align=right | Theodore E. Burton ! rowspan=3 | 21
|- style="height:2em" ! rowspan=7 | 15 | rowspan=7 align=left | Atlee Pomerene | rowspan=7 | Democratic | rowspan=7 nowrap | Mar 4, 1911 –Mar 3, 1923 | rowspan=3 | Elected Jan 10, 1911. | rowspan=3 | 19
|- style="height:2em"
|- style="height:2em" | | rowspan=4 | 20 | rowspan=3 | Elected in 1914.Retired to run for U.S. President.Resigned to become U.S. President. | rowspan=3 nowrap | Mar 4, 1915 –Jan 13, 1921 | rowspan=3 | Republican | rowspan=3 align=right | Warren G. Harding ! rowspan=3 | 22
|- style="height:2em" | rowspan=4 | Re-elected in 1916.Lost re-election. | rowspan=4 | 20
|- style="height:2em"
|- style="height:2em" | Appointed to finish Harding's term, having been elected to the next term. | rowspan=5 nowrap | Jan 14, 1921 –Mar 30, 1928 | rowspan=5 | Republican | rowspan=5 align=right | Frank B. Willis ! rowspan=5 | 23
|- style="height:2em" | | rowspan=3 | 21 | rowspan=3 | Elected in 1920.
|- style="height:2em" ! rowspan=12 | 16 | rowspan=12 align=left | Simeon D. Fess | rowspan=12 | Republican | rowspan=12 nowrap | Mar 4, 1923 –Jan 3, 1935 | rowspan=6 | Elected in 1922. | rowspan=6 | 21
|- style="height:2em"
|- style="height:2em" | | rowspan=9 | 22 | Re-elected in 1926.Died.
|- style="height:2em"
| nowrap | Mar 30, 1928 –Apr 5, 1928 | colspan=3 | Vacant
|- style="height:2em" | Appointed to continue Willis's term.Lost nomination to finish Willis's term. | nowrap | Apr 5, 1928 –Dec 14, 1928