New Hampshire was admitted to the Union on June 21, 1788. It elects United States senators to class 2 and class 3. The state's current senators are Democrats Jeanne Shaheen and Maggie Hassan making it one of only four states alongside Minnesota, Nevada and Washington to have two female U.S. senators. Senator Shaheen is currently serving her third term (since 2009); Senator Hassan is currently serving her second term (since 2017). Jacob Harold Gallinger was New Hampshire's longest-serving senator (1891–1918).
List of senators
|- style="height:2em" ! rowspan=2 | 1 | rowspan=2 align=left | Paine Wingate | rowspan=2 | Anti-Admin. | rowspan=2 nowrap | Mar 4, 1789 –Mar 3, 1793 | rowspan=2 | Josiah Bartlett was at first elected in 1788, but "declined the appointment." Elected in 1789.Lost re-election. | rowspan=2 | 1 | | rowspan=3 | 1 | rowspan=3 | Elected in 1788. | rowspan=6 nowrap | Mar 4, 1789 –Mar 3, 1801 | rowspan=2 | Pro-Admin. | rowspan=6 align=right | John Langdon ! rowspan=6 | 1
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|- style="height:2em" ! rowspan=5 | 2 | rowspan=5 align=left | Samuel Livermore | | Pro-Admin. | rowspan=5 nowrap | Mar 4, 1793 –Jun 12, 1801 | rowspan=3 | Elected in 1792. | rowspan=3 | 2 | | | Anti-Admin.
|- style="height:2em" | rowspan=4 | Federalist | | rowspan=3 | 2 | rowspan=3 | Re-election year unknown. | rowspan=3 | Democratic-Republican
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|- style="height:2em" | rowspan=2 | Re-elected in 1798.Resigned. | rowspan=7 | 3
|- style="height:2em" | rowspan=5 | rowspan=7 | 3 | rowspan=3 | Elected in 1800.Resigned. | rowspan=3 nowrap | Mar 4, 1801 –Jun 14, 1802 | rowspan=3 | Federalist | rowspan=3 align=right | James Sheafe ! rowspan=3 | 2
|- style="height:2em" | colspan=3 | Vacant | nowrap | Jun 12, 1801 –Jun 17, 1801
|- style="height:2em" ! rowspan=4 | 3 | rowspan=4 align=left | Simeon Olcott | rowspan=4 | Federalist | rowspan=4 nowrap | Jun 17, 1801 –Mar 3, 1805 | rowspan=4 | Elected in 1801 to finish Livermore's term.
|- style="height:2em"
| nowrap | Jun 14, 1802 –Jun 17, 1802 | colspan=3 | Vacant
|- style="height:2em" | rowspan=3 | Elected in 1802 to finish Sheafe's term.Retired. | rowspan=3 nowrap | Jun 17, 1802 –Mar 3, 1807 | rowspan=3 | Federalist | rowspan=3 align=right | William Plumer ! rowspan=3 | 3
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|- style="height:2em" ! rowspan=9 | 4 | rowspan=9 align=left | Nicholas Gilman | rowspan=9 | Democratic-Republican | rowspan=9 nowrap | Mar 4, 1805 –May 2, 1814 | rowspan=5 | Elected in 1804. | rowspan=5 | 4
|- style="height:2em" | | rowspan=5 | 4 | rowspan=2 | Elected in 1807.Resigned. | rowspan=2 nowrap | Mar 4, 1807 –Jun 1, 1810 | rowspan=2 | Democratic-Republican | rowspan=2 align=right nowrap | Nahum Parker ! rowspan=2 | 4
|- style="height:2em" | rowspan=3
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| nowrap | Jun 1, 1810 –Jun 21, 1810 | colspan=3 | Vacant
|- style="height:2em" | rowspan=2 | Elected in 1810 to finish Parker's term. | rowspan=2 nowrap | Jun 21, 1810 –Mar 3, 1813 | rowspan=2 | Federalist | rowspan=2 align=right nowrap | Charles Cutts ! rowspan=4 | 5
|- style="height:2em" | rowspan=4 | Re-elected in 1810.Died. | rowspan=7 | 5
|- style="height:2em" | rowspan=5 | rowspan=9 | 5 | Legislature failed to elect. | nowrap | Mar 4, 1813 –Apr 2, 1813 | colspan=2 | Vacant
|- style="height:2em" | Appointed to continue the term.Retired when successor elected. | nowrap | Apr 2, 1813 –Jun 10, 1813 | | Federalist | align=right nowrap | Charles Cutts
|- style="height:2em" | rowspan=5 | Elected in 1813 to finish the vacant term that happened in 1813.Resigned. | rowspan=5 nowrap | Jun 10, 1813 –Jun 16, 1817 | rowspan=5 | Federalist | rowspan=5 align=right | Jeremiah Mason ! rowspan=5 | 6
|- style="height:2em" | colspan=3 | Vacant | nowrap | May 2, 1814 –Jun 24, 1814
|- style="height:2em" ! rowspan=2 | 5 | rowspan=2 align=left | Thomas W. Thompson | rowspan=2 | Federalist | rowspan=2 nowrap | Jun 24, 1814 –Mar 3, 1817 | rowspan=2 | Elected in 1814 to finish Gilman's term.
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|- style="height:2em" ! rowspan=5 | 6 | rowspan=5 align=left | David L. Morril | rowspan=5 | Democratic-Republican | rowspan=5 nowrap | Mar 4, 1817 –Mar 3, 1823 | rowspan=5 | Elected in 1816.Retired. | rowspan=5 | 6 | rowspan=3
|- style="height:2em"
| nowrap | Jun 16, 1817 –Jun 27, 1817 | colspan=3 | Vacant
|- style="height:2em" | Elected in 1817 to finish the vacant term that happened in 1813. | nowrap | Jun 27, 1817 –Mar 3, 1819 | | Democratic-Republican | align=right | Clement Storer ! 7
|- style="height:2em" | | rowspan=3 | 6 | rowspan=3 | Elected in 1818. | rowspan=3 nowrap | Mar 4, 1819 –Mar 3, 1825 | rowspan=3 | Democratic-Republican | rowspan=3 align=right | John Fabyan Parrott ! rowspan=3 | 8
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|- style="height:2em" ! rowspan=7 | 7 | rowspan=7 align=left | Samuel Bell | | Democratic-Republican | rowspan=7 nowrap | Mar 4, 1823 –Mar 3, 1835 | rowspan=4 | Elected in 1823. | rowspan=4 | 7
|- style="height:2em" | rowspan=6 | NationalRepublican | rowspan=2 | rowspan=4 | 7
| nowrap | Mar 3, 1825 –Mar 16, 1825 | colspan=3 | Vacant
|- style="height:2em" | rowspan=3 | Elected in 1825. | rowspan=3 nowrap | Mar 16, 1825 –Mar 3, 1831 | rowspan=3 | Jacksonian | rowspan=3 align=right | Levi Woodbury ! rowspan=3 | 9
|- style="height:2em"
|- style="height:2em" | rowspan=3 | Re-elected in 1828 or 1829.Retired. | rowspan=3 | 8
|- style="height:2em" | | rowspan=5 | 8 | rowspan=3 | Elected in 1831.Resigned to become Governor of New Hampshire. | rowspan=3 nowrap | Mar 4, 1831 –May 30, 1836 | rowspan=3 | Jacksonian | rowspan=3 align=right | Isaac Hill ! rowspan=3 | 10
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|- style="height:2em" ! rowspan=5 | 8 | rowspan=5 align=left | Henry Hubbard | rowspan=3 | Jacksonian | rowspan=5 nowrap | Mar 4, 1835 –Mar 3, 1841 | rowspan=5 | Elected in 1835.Retired to run for Governor of New Hampshire. | rowspan=5 | 9 | rowspan=3
|- style="height:2em"
| nowrap | May 30, 1836 –Jun 8, 1836 | colspan=3 | Vacant
|- style="height:2em" | Elected in 1836 to finish Hill's term.Lost re-election. | nowrap | Jun 8, 1836 –Mar 3, 1837 | | Jacksonian | align=right | John Page ! 11
|- style="height:2em" | rowspan=2 | Democratic | | rowspan=4 | 9 | rowspan=3 | Elected in 1837.Resigned. | rowspan=3 nowrap | Mar 4, 1837 –Feb 28, 1842 | rowspan=3 | Democratic | rowspan=3 align=right | Franklin Pierce ! rowspan=3 | 12
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|- style="height:2em" ! rowspan=4 | 9 | rowspan=4 align=left | Levi Woodbury | rowspan=4 | Democratic | rowspan=4 nowrap | Mar 4, 1841 –Sep 20, 1845 | rowspan=4 | Elected in 1841.Resigned to become a Justice of the U.S. Supreme Court. | rowspan=7 | 10 | rowspan=2
|- style="height:2em" | Appointed to continue Pierce's term.Elected in 1842 to finish Pierce's term. | nowrap | Mar 1, 1842 –Mar 3, 1843 | | Democratic | align=right | Leonard Wilcox ! 13
|- style="height:2em" | | rowspan=6 | 10 | rowspan=6 | Elected in 1843. | rowspan=6 nowrap | Mar 4, 1843 –Mar 3, 1849 | rowspan=6 | Democratic | rowspan=6 align=right | Charles G. Atherton ! rowspan=6 | 14
|- style="height:2em" | rowspan=4
|- style="height:2em" | colspan=3 | Vacant | nowrap | Sep 20, 1845 –Dec 1, 1845
|- style="height:2em" ! 10 | align=left | Benning W. Jenness | | Democratic | nowrap | Dec 1, 1845 –Jun 13, 1846 | Appointed to continue Woodbury's term.Lost election to finish Woodbury's term.
|- style="height:2em" ! 11 | align=left | Joseph Cilley | | Liberty | nowrap | Jun 13, 1846 –Mar 3, 1847 | Elected in 1846 to finish Woodbury's term.Lost election to next term.
|- style="height:2em" ! rowspan=3 | 12 | rowspan=3 align=left | John P. Hale | | IndependentDemocratic | rowspan=3 nowrap | Mar 4, 1847 –Mar 3, 1853 | rowspan=3 | Elected in 1846.Retired to run for President of the United States. | rowspan=3 | 11
|- style="height:2em" | rowspan=2 | Free Soil | | rowspan=8 | 11 | rowspan=6 | Elected in 1848 or 1849.Died. | rowspan=6 nowrap | Mar 4, 1849 –Jan 11, 1855 | rowspan=6 | Democratic | rowspan=6 align=right | Moses Norris Jr. ! rowspan=6 | 15
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|- style="height:2em" ! 13 | align=left | Charles G. Atherton | | Democratic | nowrap | Mar 4, 1853 –Nov 15, 1853 | Elected in 1852.Died. | rowspan=11 | 12 | rowspan=6
|- style="height:2em" | colspan=3 | Vacant | nowrap | Nov 15, 1853 –Nov 29, 1853
|- style="height:2em" ! 14 | align=left | Jared W. Williams | | Democratic | nowrap | Nov 29, 1853 –Jul 15, 1854 | Appointed to continue Atherton's term.Appointment expired without election.
|- style="height:2em" | rowspan=4 colspan=3 | Vacant | rowspan=4 nowrap | Jul 15, 1854 –Jul 30, 1855 | rowspan=4 |
|- style="height:2em"
| nowrap | Jan 11, 1855 –Jan 16, 1855 | colspan=3 | Vacant
|- style="height:2em" | Appointed to finish Norris's term. | nowrap | Jan 16, 1855 –Mar 3, 1855 | | Democratic | align=right | John S. Wells ! 16
|- style="height:2em" | rowspan=2 | rowspan=6 | 12 | Legislature failed to elect. | nowrap | Mar 4, 1855 –Jul 29, 1855 | colspan=3 | Vacant
|- style="height:2em" ! rowspan=7 | 15 | rowspan=7 align=left | John P. Hale | rowspan=7 | Republican | rowspan=7 nowrap | Jul 30, 1855 –Mar 3, 1865 | rowspan=4 | Elected in 1855 to finish Atherton's term. | rowspan=2 | Elected late in 1855.Died. | rowspan=2 nowrap | Jul 30, 1855 –May 26, 1857 | rowspan=2 | Republican | rowspan=2 align=right | James Bell ! rowspan=2 | 17
|- style="height:2em" | rowspan=3
|- style="height:2em"
| nowrap | May 26, 1857 –Jun 27, 1857 | colspan=3 | Vacant
|- style="height:2em" | rowspan=2 | Elected in 1857 to finish Bell's term. | rowspan=5 nowrap | Jun 27, 1857 –Jul 27, 1866 | rowspan=5 | Republican | rowspan=5 align=right | Daniel Clark ! rowspan=5 | 18
|- style="height:2em" | rowspan=3 | Re-elected in 1859Lost re-nomination. | rowspan=3 | 13
|- style="height:2em" | | rowspan=5 | 13 | rowspan=3 | Re-elected in 1861.Resigned to become a District Court Judge for New Hampshire.
|- style="height:2em"
|- style="height:2em" ! rowspan=8 | 16 | rowspan=8 align=left | Aaron H. Cragin | rowspan=8 | Republican | rowspan=8 nowrap | Mar 4, 1865 –Mar 3, 1877 | rowspan=5 | Elected in 1864. | rowspan=5 | 14 | rowspan=3
|- style="height:2em"
| nowrap | Jul 27, 1866 –Aug 31, 1866 | colspan=3 | Vacant
|- style="height:2em" | Appointed to finish Clark's term.Retired. | nowrap | Aug 31, 1866 –Mar 3, 1867 | | Republican | align=right | George G. Fogg ! 19
|- style="height:2em" | | rowspan=3 | 14 | rowspan=3 | Elected in 1866 or 1867.Lost renomination. | rowspan=3 nowrap | Mar 4, 1867 –Mar 3, 1873 | rowspan=3 | Republican | rowspan=3 align=right | James W. Patterson ! rowspan=3 | 20
|- style="height:2em"
|- style="height:2em" | rowspan=3 | Re-elected in 1870. | rowspan=3 | 15
|- style="height:2em" | | rowspan=3 | 15 | rowspan=3 | Elected in 1872.Lost re-election. | rowspan=3 nowrap | Mar 4, 1873 –Mar 3, 1879 | rowspan=3 | Republican | rowspan=3 align=right | Bainbridge Wadleigh ! rowspan=3 | 21
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|- style="height:2em" ! rowspan=6 | 17 | rowspan=6 align=left | Edward H. Rollins | rowspan=6 | Republican | rowspan=6 nowrap | Mar 4, 1877 –Mar 3, 1883 | rowspan=6 | Elected in 1876.Lost re-election. | rowspan=6 | 16
|- style="height:2em" | rowspan=4 | rowspan=7 | 16 | Legislature failed to elect. | nowrap | Mar 3, 1879 –Mar 18, 1879 | colspan=3 | Vacant
|- style="height:2em" | Appointed to fill vacancy caused by legislature's failure to elect.Retired. | nowrap | Mar 18, 1879 –Jun 18, 1879 | | Republican | align=right | Charles H. Bell ! 22
|- style="height:2em"
| nowrap | Jun 18, 1879 –Jun 20, 1879 | colspan=3 | Vacant
|- style="height:2em" | rowspan=4 | Elected in 1879 to finish the vacant term. | rowspan=4 nowrap | Jun 20, 1879 –Mar 3, 1885 | rowspan=4 | Republican | rowspan=4 align=right | Henry W. Blair ! rowspan=12 | 23
|- style="height:2em"
|- style="height:2em" | colspan=3 | Vacant | nowrap | Mar 4, 1883 –Aug 2, 1883 | Legislature failed to elect.