| State | Service Length | Years | Senator | % Correct |
|---|---|---|---|---|
| Iowa | 16,192+ | 1981- | Chuck Grassley | 90%
|
| Kentucky | 14,731+ | 1985- | Mitch McConnell | 85%
|
| New York | 9,618+ | 1999- | Chuck Schumer | 82%
|
| Delaware | 13,161 | 1973-2009 | Joe Biden | 82%
|
| West Virginia | 18,804 | 1959-2010 | Robert Byrd | 79%
|
| South Carolina | 17,325 | 1954-1956; 1956-2003 | Strom Thurmond | 79%
|
| Virginia | 11,938 | 1933-1965 | Harry F. Byrd | 77%
|
| California | 11,286 | 1992-2023 | Dianne Feinstein | 74%
|
| Vermont | 17,532 | 1975-2023 | Patrick Leahy | 74%
|
| Nevada | 10,959 | 1987-2017 | Harry Reid | 72%
|
| Utah | 15,340 | 1977-2019 | Orrin Hatch | 72%
|
| Massachusetts | 17,093 | 1962-2009 | Ted Kennedy | 67%
|
| Hawaii | 18,246 | 1963-2012 | Daniel Inouye | 64%
|
| Alabama | 13,149 | 1987-2023 | Richard Shelby | 64%
|
| Alaska | 14,620 | 1968-2009 | Ted Stevens | 46%
|
| Maryland | 10,958 | 1987-2017 | Barbara Mikulski | 44%
|
| Pennsylvania | 10,957 | 1981-2011 | Arlen Specter | 41%
|
| Connecticut | 10,957 | 1981-2011 | Chris Dodd | 41%
|
| Oklahoma | 10,275 | 1994-2023 | Jim Inhofe | 41%
|
| Indiana | 13,149 | 1977-2013 | Richard Lugar | 41%
|
| Michigan | 13,149 | 1979-2015 | Carl Levin | 38%
|
| Louisiana | 13,882 | 1948-1987 | Russell B. Long | 38%
|
| Montana | 12,837 | 1978-2014 | Max Baucus | 36%
|
| New Mexico | 13,149 | 1973-2009 | Pete Domenici | 33%
|
| New Jersey | 10,388 | 1982-2001; 2003-2013 | Frank Lautenberg | 31%
|
| Georgia | 13,888 | 1933-1971 | Richard Russell Jr. | 31%
|
| North Carolina | 10,957 | 1973-2003 | Jesse Helms | 28%
|
| Rhode Island | 13,149 | 1961-1997 | Claiborne Pell | 23%
|
| Mississippi | 15,035 | 1947-1989 | John C. Stennis | 23%
|
| Arizona | 15,281 | 1927-1969 | Carl Hayden | 21%
|
| Oregon | 10,951 | 1967-1997 | Mark Hatfield | 21%
|
| Wisconsin | 11,451 | 1957-1989 | William Proxmire | 21%
|
| Wyoming | 13,513 | 1890-1893; 1895-1929 | Francis E. Warren | 18%
|
| Minnesota | 10,281 | 1895-1923 | Knute Nelson | 18%
|
| North Dakota | 13,081 | 1945-1981 | Milton Young | 18%
|
| Washington | 13,169 | 1944-1981 | Warren Magnuson | 18%
|
| Nebraska | 10,897 | 1913-1943 | George W. Norris | 15%
|
| Arkansas | 12,748 | 1943-1977 | John L. McClellan | 15%
|
| Tennessee | 13,089 | 1917-1953 | Kenneth McKellar | 15%
|
| Kansas | 10,898 | 1919-1949 | Arthur Capper | 13%
|
| Florida | 9,967 | 1909-1936 | Duncan U. Fletcher | 13%
|
| South Dakota | 8,769 | 1948-1973 | Karl E. Mundt | 13%
|
| Texas | 10,292 | 1913-1941 | Morris Sheppard | 13%
|
| Ohio | 11,675 | 1861-1877; 1881-1897 | John Sherman | 10%
|
| Idaho | 12,009 | 1907-1940 | William Borah | 10%
|
| Missouri | 10,956 | 1875-1905 | Francis Cockrell | 8%
|
| Colorado | 10,738 | 1876-1882; 1885-1909 | Henry M. Teller | 8%
|
| New Hampshire | 10,027 | 1891-1918 | Jacob Harold Gallinger | 8%
|
| Illinois | 10,956 | 1883-1913 | Shelby Moore Cullom | 8%
|
| Maine | 11,099 | 1881-1911 | William P. Frye | 8%
|