# List of United States senators in the 115th Congress

This is a complete list of United States senators during the 115th United States Congress listed by seniority, from January 3, 2017, to January 3, 2019. It is a historical listing and will contain people who have not served the entire two-year Congress on account of resignations, deaths, or expulsions.
In this Congress, Bill Cassidy is the most junior senior senator. Jeff Sessions was the most senior junior senator at the start of this Congress, but resigned on February 8, 2017, to become United States Attorney General. Maria Cantwell has remained the most senior junior senator since.
Order of service is based on the commencement of the senator's first term. Behind this is former service as a senator (only giving the senator seniority within his or her new incoming class), service as vice president, a House member, a cabinet secretary, or a governor of a state. The final factor is the population of the senator's state.

## Terms of service

| Class | Terms of service of senators that expired in years |
| Class 1 | Terms of service of senators that expired in 2019 (Arizona, California, Connecticut, Delaware, Florida, Hawaii, Indiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Jersey, New Mexico, New York, North Dakota, Ohio, Pennsylvania, Rhode Island, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, and Wyoming.) |
| Class 2 | Terms of service of senators that expired in 2021 (Alabama, Alaska, Arkansas, Colorado, Delaware, Georgia, Iowa, Idaho, Illinois, Kansas, Kentucky, Louisiana, Massachusetts, Maine, Michigan, Minnesota, Mississippi, Montana, North Carolina, Nebraska, New Hampshire, New Jersey, New Mexico, Oklahoma, Oregon, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Virginia, West Virginia, and Wyoming.) |
| Class 3 | Terms of service of senators that expired in 2023 (Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Idaho, Illinois, Iowa, Indiana, Kansas, Kentucky, Louisiana, Massachusetts, Maine, Michigan, Minnesota, Mississippi, North Carolina, North Dakota, New Hampshire, New Mexico, Nevada, New York, Oklahoma, Oregon, South Carolina, South Dakota, Tennessee, Utah, Washington and Wisconsin.) |

## U.S. Senate seniority list

| Rank | Historical rank | Senator | Party | State | Seniority date | Other factors |
| 1 | 1692 | Patrick Leahy | Democratic | Vermont | January 3, 1975 | |
| 2 | 1708 | Orrin Hatch | Republican | Utah | January 3, 1977 | |
| 3 | 1719 | Thad Cochran | Republican | Mississippi | December 27, 1978 | |
| 4 | 1743 | Chuck Grassley | Republican | Iowa | January 3, 1981 | |
| 5 | 1766 | Mitch McConnell | Republican | Kentucky | January 3, 1985 | |
| 6 | 1775 | Richard Shelby | Republican | Alabama | January 3, 1987 | Former member of the U.S. House of Representatives (8 years) |
| 7 | 1777 | John McCain | Republican | Arizona | January 3, 1987 | Former member of the U.S. House of Representatives (4 years) |
| 8 | 1801 | Dianne Feinstein | Democratic | California | November 10, 1992 | |
| 9 | 1812 | Patty Murray | Democratic | Washington | January 3, 1993 | |
| 10 | 1816 | Jim Inhofe | Republican | Oklahoma | November 17, 1994 | |
| 11 | 1827 | Ron Wyden | Democratic | Oregon | February 6, 1996 | |
| 12 | 1830 | Pat Roberts | Republican | Kansas | January 3, 1997 | Former member of the U.S. House of Representatives (16 years) |
| 13 | 1831 | Dick Durbin | Democratic | Illinois | January 3, 1997 | Former member of the U.S. House of Representatives (14 years) |
| 14 | 1835 | Jack Reed | Democratic | Rhode Island | January 3, 1997 | Former member of the U.S. House of Representatives (6 years) |
| 15 | 1839 | Jeff Sessions | Republican | Alabama | January 3, 1997 | Alabama 22nd in population (1990) |
| 16 | 1842 | Susan Collins | Republican | Maine | January 3, 1997 | Maine 38th in population (1990) |
| 17 | 1843 | Mike Enzi | Republican | Wyoming | January 3, 1997 | Wyoming 50th in population (1990) |
| 18 | 1844 | Chuck Schumer | Democratic | New York | January 3, 1999 | Former member of the U.S. House of Representatives (18 years) |
| 19 | 1846 | Mike Crapo | Republican | Idaho | January 3, 1999 | Former member of the U.S. House of Representatives (6 years) |
| 20 | 1854 | Bill Nelson | Democratic | Florida | January 3, 2001 | Former member of the U.S. House of Representatives (12 years) |
| 21 | 1855 | Tom Carper | Democratic | Delaware | January 3, 2001 | Former member of the U.S. House of Representatives (10 years) |
| 22 | 1856 | Debbie Stabenow | Democratic | Michigan | January 3, 2001 | Former member of the U.S. House of Representatives (4 years) |
| 23 | 1859 | Maria Cantwell | Democratic | Washington | January 3, 2001 | Former member of the U.S. House of Representatives (2 years) |
| 24 | 1873 | John Cornyn | Republican | Texas | December 1, 2002 | |
| 25 | 1867 | Lisa Murkowski | Republican | Alaska | December 20, 2002 | |
| 26 | 1869 | Lindsey Graham | Republican | South Carolina | January 3, 2003 | Former member of the U.S. House of Representatives |
| 27 | 1871 | Lamar Alexander | Republican | Tennessee | January 3, 2003 | |
| 28 | 1876 | Richard Burr | Republican | North Carolina | January 3, 2005 | Former member of the U.S. House of Representatives (10 years) |
| 29 | 1879 | John Thune | Republican | South Dakota | January 3, 2005 | Former member of the U.S. House of Representatives (6 years) |
| 30 | 1880 | Johnny Isakson | Republican | Georgia | January 3, 2005 | Former member of the U.S. House of Representatives (5 years, 10 months) |
| 31 | 1885 | Bob Menendez | Democratic | New Jersey | January 18, 2006 | |
| 32 | 1886 | Ben Cardin | Democratic | Maryland | January 3, 2007 | Former member of the U.S. House of Representatives (20 years) |
| 33 | 1887 | Bernie Sanders | Independent | Vermont | January 3, 2007 | Former member of the U.S. House of Representatives (16 years) |
| 34 | 1888 | Sherrod Brown | Democratic | Ohio | January 3, 2007 | Former member of the U.S. House of Representatives (14 years) |
| 35 | 1889 | Bob Casey, Jr. | Democratic | Pennsylvania | January 3, 2007 | Pennsylvania 6th in population (2000) |
| 36 | 1891 | Bob Corker | Republican | Tennessee | January 3, 2007 | Tennessee 16th in population (2000) |
| 37 | 1892 | Claire McCaskill | Democratic | Missouri | January 3, 2007 | Missouri 17th in population (2000) |
| 38 | 1893 | Amy Klobuchar | Democratic | Minnesota | January 3, 2007 | Minnesota 21st in population (2000) |
| 39 | 1894 | Sheldon Whitehouse | Democratic | Rhode Island | January 3, 2007 | Rhode Island 43rd in population (2000) |
| 40 | 1895 | Jon Tester | Democratic | Montana | January 3, 2007 | Montana 44th in population (2000) |
| 41 | 1896 | John Barrasso | Republican | Wyoming | June 25, 2007 | |
| 42 | 1897 | Roger Wicker | Republican | Mississippi | December 31, 2007 | |
| 43 | 1899 | Tom Udall | Democratic | New Mexico | January 3, 2009 | Former member of the U.S. House of Representatives |
| 44 | 1901 | Jeanne Shaheen | Democratic | New Hampshire | January 3, 2009 | Former governor (6 years) |
| 45 | 1902 | Mark Warner | Democratic | Virginia | January 3, 2009 | Former governor (4 years) |
| 46 | 1903 | Jim Risch | Republican | Idaho | January 3, 2009 | Former governor (7 months) |
| 47 | 1905 | Jeff Merkley | Democratic | Oregon | January 3, 2009 | |
| 48 | 1909 | Michael Bennet | Democratic | Colorado | January 21, 2009 | |
| 49 | 1910 | Kirsten Gillibrand | Democratic | New York | January 26, 2009 | |
| 50 | 1911 | Al Franken | Democratic | Minnesota | July 7, 2009 | |
| 51 | 1916 | Joe Manchin | Democratic | West Virginia | November 15, 2010 | Former governor |
| 52 | 1917 | Chris Coons | Democratic | Delaware | November 15, 2010 | |
| 53 | 1919 | Roy Blunt | Republican | Missouri | January 3, 2011 | Former member of the U.S. House of Representatives (14 years); Missouri 17th in population (2000) |
| 54 | 1920 | Jerry Moran | Republican | Kansas | January 3, 2011 | Former member of the U.S. House of Representatives (14 years); Kansas 32nd in population (2000) |
| 55 | 1921 | Rob Portman | Republican | Ohio | January 3, 2011 | Former member of the U.S. House of Representatives (12 years) |
| 56 | 1922 | John Boozman | Republican | Arkansas | January 3, 2011 | Former member of the U.S. House of Representatives (9 years) |
| 57 | 1923 | Pat Toomey | Republican | Pennsylvania | January 3, 2011 | Former member of the U.S. House of Representatives (6 years) |
| 58 | 1924 | John Hoeven | Republican | North Dakota | January 3, 2011 | Former governor |
| 59 | 1925 | Marco Rubio | Republican | Florida | January 3, 2011 | Florida 4th in population (2000) |
| 60 | 1926 | Ron Johnson | Republican | Wisconsin | January 3, 2011 | Wisconsin 18th in population (2000) |
| 61 | 1927 | Rand Paul | Republican | Kentucky | January 3, 2011 | Kentucky 25th in population (2000) |
| 62 | 1928 | Richard Blumenthal | Democratic | Connecticut | January 3, 2011 | Connecticut 29th in population (2000) |
| 63 | 1929 | Mike Lee | Republican | Utah | January 3, 2011 | Utah 34th in population (2000) |
| 64 | 1931 | Dean Heller | Republican | Nevada | May 9, 2011 | |
| 65 | 1932 | Brian Schatz | Democratic | Hawaii | December 27, 2012 | |
| 66 | 1933 | Tim Scott | Republican | South Carolina | January 2, 2013 | |
| 67 | 1934 | Tammy Baldwin | Democratic | Wisconsin | January 3, 2013 | Former member of the U.S. House of Representatives (14 years) |
| 68 | 1935 | Jeff Flake | Republican | Arizona | January 3, 2013 | Former member of the U.S. House of Representatives (12 years) |
| 69 | 1936 | Joe Donnelly | Democratic | Indiana | January 3, 2013 | Former member of the U.S. House of Representatives (6 years); Indiana 16th in population (2010) |
| 70 | 1937 | Chris Murphy | Democratic | Connecticut | January 3, 2013 | Former member of the U.S. House of Representatives (6 years); Connecticut 29th in population (2010) |
| 71 | 1938 | Mazie Hirono | Democratic | Hawaii | January 3, 2013 | Former member of the U.S. House of Representatives (6 years); Hawaii 42nd in population (2010) |
| 72 | 1939 | Martin Heinrich | Democratic | New Mexico | January 3, 2013 | Former member of the U.S. House of Representatives (4 years) |
| 73 | 1940 | Angus King | Independent | Maine | January 3, 2013 | Former governor (8 years) |
| 74 | 1941 | Tim Kaine | Democratic | Virginia | January 3, 2013 | Former governor (4 years) |
| 75 | 1942 | Ted Cruz | Republican | Texas | January 3, 2013 | Texas 2nd in population (2010) |
| 76 | 1943 | Elizabeth Warren | Democratic | Massachusetts | January 3, 2013 | Massachusetts 15th in population (2010) |
| 77 | 1944 | Deb Fischer | Republican | Nebraska | January 3, 2013 | Nebraska 38th in population (2010) |
| 78 | 1945 | Heidi Heitkamp | Democratic | North Dakota | January 3, 2013 | North Dakota 48th in population (2010) |
| 79 | 1948 | Ed Markey | Democratic | Massachusetts | July 16, 2013 | |
| 80 | 1949 | Cory Booker | Democratic | New Jersey | October 31, 2013 | |
| 81 | 1951 | Shelley Moore Capito | Republican | West Virginia | January 3, 2015 | Former member of the U.S. House of Representatives (14 years) |
| 82 | 1952 | Gary Peters | Democratic | Michigan | January 3, 2015 | Former member of the U.S. House of Representatives (6 years); Michigan 9th in population (2010) |
| 83 | 1953 | Bill Cassidy | Republican | Louisiana | January 3, 2015 | Former member of the U.S. House of Representatives (6 years); Louisiana 25th in population (2010) |
| 84 | 1954 | Cory Gardner | Republican | Colorado | January 3, 2015 | Former member of the U.S. House of Representatives (4 years); Colorado 22nd in population (2010) |
| 85 | 1955 | James Lankford | Republican | Oklahoma | January 3, 2015 | Former member of the U.S. House of Representatives (4 years); Oklahoma 28th in population (2010) |
| 86 | 1956 | Tom Cotton | Republican | Arkansas | January 3, 2015 | Former member of the U.S. House of Representatives (2 years); Arkansas 32nd in population (2010) |
| 87 | 1957 | Steve Daines | Republican | Montana | January 3, 2015 | Former member of the U.S. House of Representatives (2 years); Montana 44th in population (2010) |
| 88 | 1958 | Mike Rounds | Republican | South Dakota | January 3, 2015 | Former governor |
| 89 | 1959 | David Perdue | Republican | Georgia | January 3, 2015 | Georgia 8th in population (2010) |
| 90 | 1960 | Thom Tillis | Republican | North Carolina | January 3, 2015 | North Carolina 10th in population (2010) |
| 91 | 1961 | Joni Ernst | Republican | Iowa | January 3, 2015 | Iowa 30th in population (2010) |
| 92 | 1962 | Ben Sasse | Republican | Nebraska | January 3, 2015 | Nebraska 37th in population (2010) |
| 93 | 1963 | Dan Sullivan | Republican | Alaska | January 3, 2015 | Alaska 47th in population (2010) |
| 94 | 1964 | Chris Van Hollen | Democratic | Maryland | January 3, 2017 | Former member of the U.S. House of Representatives (14 years) |
| 95 | 1965 | Todd Young | Republican | Indiana | January 3, 2017 | Former member of the U.S. House of Representatives (6 years) |
| 96 | 1966 | Tammy Duckworth | Democratic | Illinois | January 3, 2017 | Former member of the U.S. House of Representatives (4 years) |
| 97 | 1967 | Maggie Hassan | Democratic | New Hampshire | January 3, 2017 | Former governor |
| 98 | 1968 | Kamala Harris | Democratic | California | January 3, 2017 | California 1st in population (2010) |
| 99 | 1969 | John Neely Kennedy | Republican | Louisiana | January 3, 2017 | Louisiana 25th in population (2010) |
| 100 | 1970 | Catherine Cortez Masto | Democratic | Nevada | January 3, 2017 | Nevada 35th in population (2010) |
| | 1971 | Luther Strange | Republican | Alabama | February 9, 2017 | |
| | 1972 | Tina Smith | Democratic | Minnesota | January 3, 2018 | Minnesota 21st in population (2010) |
| | 1973 | Doug Jones | Democratic | Alabama | January 3, 2018 | Alabama 23rd in population (2010) |
| | 1974 | Cindy Hyde-Smith | Republican | Mississippi | April 2, 2018 | |
| | 1820 | Jon Kyl | Republican | Arizona | September 4, 2018 | |
The most senior senators by class were Orrin Hatch (R-Utah) from Class 1, Thad Cochran (R-Mississippi) from Class 2, and Patrick Leahy (D-Vermont) from Class 3. Cochran resigned on April 1, 2018 with Mitch McConnell (R-Kentucky) became the most senior senator from his class.