| CONGRESS | SENATOR | TERM BEGAN | TERM ENDED | COMMENTS |
|---|---|---|---|---|
| Class 2 | ||||
| 1st-2nd | Paine Wingate (ANTI-ADMIN) | Mar. 4, 1789 | Mar. 3, 1793 | |
| 3rd-7th | Samuel Livermore (PRO-ADMIN, F) | Mar. 4, 1793 | Jun. 12, 1801 | Resigned |
| 7th-8th | Simeon Olcott (F) | Jun. 17, 1801 | Mar. 3, 1805 | |
| 13th | Nicholas Gilman (R) | Mar. 4, 1805 | May 2, 1814 | Died |
| 13th-14th | Thomas W. Thompson (F) | Jun. 24, 1814 | Mar. 3, 1817 | |
| 15th-17th | David L. Morril (R) | Mar. 4, 1817 | Mar. 3, 1823 | |
| 18th-23rd | Samuel Bell (ADAM-CLAY R, ADAMS, AJ) | Mar. 4, 1823 | Mar. 3, 1835 | |
| 24th-26th | Henry Hubbard (J, D) | Mar. 4, 1835 | Mar. 3, 1841 | |
| 27th-29th | Levi Woodbury (D) | Mar. 4, 1841 | Nov. 20, 1845 | Resigned |
| 29th | Benning W. Jenness (D) | Dec. 1, 1845 | Jun. 13, 1846 | Appointed |
| 29th | Joseph Cilley (L) | Jun. 13, 1846 | Mar. 3, 1847 | |
| 30th-32nd | John P. Hale (ID, FS) | Mar. 4, 1847 | Mar. 3, 1853 | |
| 33rd | Charles G. Atherton (D) | Mar. 4, 1853 | Nov. 15, 1853 | Died |
| 33rd | Jared W. Williams (D) | Nov. 29, 1853 | Aug. 4, 18541 | Appointed |
| 34th-38th | John P. Hale (OP, R) | Jul. 30, 18552 | Mar. 3, 1865 | |
| 39th-44th | Aaron H. Cragin (R) | Mar. 4, 1865 | Mar. 3, 1877 | |
| 45th-47th | Edward H. Rollins (R) | Mar. 4, 1877 | Mar. 3, 1883 | |
| 48th-49th | Austin F. Pike (R) | Mar. 4, 1883 | Oct. 8, 1886 | Died |
| 49th-50th | Person C. Cheney (R) | Nov. 24, 1886 | Jun. 14, 1887 | Appointed |
| 50th | William E. Chandler (R) | Jun. 14, 1887 | Mar. 3, 1889 | |
| 51st | Gilman Marston (R) | Mar. 4, 1889 | Jun. 18, 1889 | Appointed |
| 51st-56th | William E. Chandler (R) | Jun. 18, 1889 | Mar. 3, 1901 | |
| 57th-62nd | Henry E. Burnham (R) | Mar. 4, 1901 | Mar. 3, 1913 | |
| 63rd-65th | Henry F. Hollis (D) | Mar. 13, 19133 | Mar. 3, 1919 | |
| 66th-74th | Henry W. Keyes (R) | Mar. 4, 1919 | Jan. 3, 1937 | |
| 75th-87th | H. Styles Bridges (R) | Jan. 3, 1937 | Nov. 26, 1961 | Died |
| 87th | Maurice J. Murphy Jr. (R) | Dec. 7, 1961 | Nov. 6, 1962 | Appointed |
| 87th-95th | Thomas J. McIntyre (D) | Nov. 7, 1962 | Jan. 3, 1979 | |
| 96th-101st | Gordon J. Humphrey (R) | Jan. 3, 1979 | Dec. 4, 1990 | Resigned |
| 101st-107th | Robert C. Smith (R) | Dec. 7, 19904 | Jan. 3, 2003 | |
| 108th-110th | John E. Sununu (R) | Jan. 3, 2003 | Jan. 3, 2009 | |
| 111th- | Jeanne Shaheen (D) | Jan. 3, 2009 | Present | |
| Class 3 | ||||
| 1st-6th | John Langdon (PRO-ADMIN, ANTI-ADMIN, R) | Mar. 4, 1789 | Mar. 3, 1801 | |
| 7th | James Sheafe (F) | Mar. 4, 1801 | Jun. 14, 1802 | Resigned |
| 7th-9th | William Plumer (F) | Jun. 17, 1802 | Mar. 3, 1807 | |
| 10th-11th | Nahum Parker (R) | Mar. 4, 1807 | Jun. 1, 1810 | Resigned |
| 11th-13th | Charles Cutts (R) | Jun. 21, 18105 | Jun. 10, 1813 | Elected; appointed |
| 13th-15th | Jeremiah Mason (F) | Jun. 10, 1813 | Jun. 16, 1817 | Resigned |
| 15th | Clement Storer (R) | Jun. 27, 1817 | Mar. 3, 1819 | |
| 16th-18th | John F. Parrott (R, ADAMS-CLAY R) | Mar. 4, 1819 | Mar. 3, 1825 | |
| 19th-21st | Levi Woodbury (J, D) | Jun. 16, 1825 | Mar. 3, 1831 | |
| 22nd-24th | Isaac Hill (J) | Mar. 4, 1831 | May 30, 1836 | Resigned |
| 24th | John Page (J) | Jun. 8, 1836 | Mar. 3, 1837 | |
| 25th-27th | Franklin Pierce (D) | Mar. 4, 1837 | Feb. 28, 1842 | Resigned |
| 27th | Leonard Wilcox (D) | Mar. 1, 1842 | Mar. 3, 1843 | Appointed, then elected |
| 28th-30th | Charles G. Atherton (D) | Mar. 4, 1843 | Mar. 3, 1849 | |
| 31st-33rd | Moses Norris Jr. (D) | Mar. 4, 1849 | Jan. 11, 1855 | Died |
| 33rd | John S. Wells (D) | Jan. 16, 1855 | Mar. 3, 1855 | Appointed |
| 34th-35th | James Bell (OP, R) | Jul. 30, 18556 | May 26, 1857 | Died |
| 35th-39th | Daniel Clark (R) | Jun. 27, 1857 | Jul. 27, 1866 | Resigned |
| 39th | George G. Fogg (R) | Aug. 31, 1866 | Mar. 3, 1867 | Appointed |
| 40th-42nd | James W. Patterson (R) | Mar. 4, 1867 | Mar. 3, 1873 | |
| 43rd-45th | Bainbridge Wadleigh (R) | Mar. 4, 1873 | Mar. 3, 1879 | |
| 46th | Charles H. Bell (R) | Mar. 13, 1879 | Jun. 16, 1879 | Appointed |
| 46th-51st | Henry W. Blair7 (R) | Jun. 17, 1879 | Mar. 3, 1891 | Appointed |
| 52nd-66th | Jacob H. Gallinger (R) | Mar. 4, 1891 | Aug. 17, 1918 | Died |
| 65th | Irving W. Drew (R) | Sept. 2, 1918 | Nov. 5, 1918 | Appointed |
| 65th-72nd | George H. Moses (R) | Nov. 6, 1918 | Mar. 3, 1933 | |
| 73rd-75th | Fred H. Brown (D) | Mar. 4, 1933 | Jan. 3, 1939 | |
| 76th-83rd | Charles W. Tobey (R) | Jan. 3, 1939 | Jul. 24, 1953 | Died |
| 83rd | Robert W. Upton (R) | Aug. 14, 1953 | Nov. 7, 1954 | Appointed |
| 83rd-93rd | Norris H. Cotton (R) | Nov. 8, 19538 | Dec. 31, 1974 | Resigned |
| 93rd | Louis C. Wyman (R) | Dec. 31, 1974 | Jan. 3, 1975 | Appointed |
| 94th | Norris H. Cotton (R) | Aug. 8, 19759 | Sept. 17, 1975 | Appointed |
| 94th-96th | John A. Durkin (D) | Sept. 18, 197510 | Dec. 29, 1980 | Resigned |
| 96th-102nd | Warren B. Rudman (R) | Dec. 29, 198011 | Jan. 3, 1993 | |
| 103rd-111th | Judd Gregg (R) | Jan. 3, 1993 | Jan. 3, 2011 | |
| 112th-114th | Kelly Ayotte (R) | Jan. 3, 2011 | Jan. 3, 2017 | |
| 115th- | Maggie Hassan (D) | Jan. 3, 2017 | Present | |
1. Appointed by governor, to fill vacancy. Senate resolution of Aug. 4, 1854, declared that representation under the appointment had expired.
2. Vacancy from Aug. 5, 1854, to July 29, 1855.
3. Vacancy from Mar. 3 to Mar. 13, because of failure of legislature to elect.
4. Elected to term commencing Jan. 3, 1991, and subsequently appointed to fill vacancy in term ending Jan. 3, 1991.
5. Elected to fill term expiring Mar. 3, 1813. Subsequently appointed to fill the vacancy occurring at the close of his term and served from Apr. 2, 1813 to Jun. 10, 1813.
6. Vacancy from Mar. 4 to July 29, 1855.
7. Initially elected to fill term ending Mar. 3, 1885. At the expiration of that term, the State legislature not being in session, he was appointed on Mar. 5, 1885, and elected on Jun. 17, 1885, to fill the vacancy in the term beginning Mar. 4, 1885.
8. Elected Nov. 2, 1954, to fill vacancy in term ending Jan. 3, 1957.
9. By governor, to fill vacancy until new senatorial election. Vacancy Jan. 3, 1975, to Aug. 8, 1975, due to contested election. On July 30, 1975, the Senate voted to declare the seat vacant as of August 8, 1975; New Hampshire called a special election to fill the seat on September 16, 1975.
10. Elected Sept. 16, 1975, to fill vacancy in unexpired term ending Jan. 3, 1981.
11. Elected to six-year term commencing Jan. 3, 1981, and subsequently appointed by governor, to fill vacancy in term ending Jan. 3, 1981.
