Republican Seniority List: 114th Congress
Source: http://www.senate.gov/artandhistory/history/resources/pdf/chronlist.pdf
Senate rank is first determined by the length of consecutive service in the Senate. For senators who entered the Senate on the same day, several tie-breaking procedures determine seniority. In order of precedence, these factors are: previous Senate service, service as the vice president, previous House service; service in the Cabinet, service as a state governor. If a tie still exists, senators are ranked according to the population of their state at the time of swearing in.
| 1. | Orrin G. Hatch, R-UT | Jan. 3, 1977 |
| 2. | Thad Cochran, R-MS | Dec. 27, 1978 |
| 3. | Charles E. Grassley, R-IA | Jan. 3, 1981 |
| 4. | Mitch McConnell, R-KY | Jan. 3, 1985 |
| 5. | Richard C. Shelby, R-AL | Jan. 3, 1987 |
| 6. | John McCain, R-AZ | Jan. 3, 1987 |
| 7. | James M. Inhofe, R-OK | Nov. 16, 1994 |
| 8. | Pat Roberts, R-KS | Jan. 3, 1997 |
| 9. | Jeff Sessions, R-AL | Jan. 3, 1997 |
| 10. | Susan Collins, R-ME | Jan. 3, 1997 |
| 11. | Michael B. Enzi, R-WY | Jan. 3, 1997 |
| 12. | Michael D. Crapo, R-ID | Jan. 3, 1999 |
| 13. | Lisa Murkowski, R-AK | Dec. 20, 2002 |
| 14. | Lindsey Graham, R-SC | Jan. 3, 2003 |
| 15. | Lamar Alexander, R-TN | Jan. 3, 2003 |
| 16. | John Cornyn, R-TX | Dec. 2, 2002* |
| 17. | Richard M. Burr, R-NC | Jan. 3, 2005 |
| 18. | John Thune, R-SD | Jan. 3, 2005 |
| 19. | Johnny Isakson, R-GA | Jan. 3, 2005 |
| 20. | David Vitter, R-LA | Jan. 3, 2005 |
| 21. | Bob Corker, R-TN | Jan. 3, 2007 |
| 22. | John A. Barrasso, R-WY | June 22, 2007 |
| 23. | Roger Wicker, R-MS | Dec. 31, 2007 |
| 24. | Jim Risch, R-ID | Jan. 3, 2009 |
| 25. | Mark Kirk, R-IL | Nov. 29, 2010 |
| 26. | Dan Coats, R-IN | Jan. 3, 2011 |
| 27. | Roy Blunt, R-MO | Jan. 3, 2011 |
| 28. | Jerry Moran, R-KS | Jan. 3, 2011 |
| 29. | Rob Portman, R-OH | Jan. 3, 2011 |
| 30. | John Boozman, R-AR | Jan. 3, 2011 |
| 31. | Pat Toomey, R-PA | Jan. 3, 2011 |
| 32. | John Hoeven, R-ND | Jan. 3, 2011 |
| 33. | Marco Rubio, R-FL | Jan. 3, 2011 |
| 34. | Ron Johnson, R-WI | Jan. 3, 2011 |
| 35. | Rand Paul, R-KY | Jan. 3, 2011 |
| 36. | Mike Lee, R-UT | Jan. 3, 2011 |
| 37. | Kelly Ayotte, R-NH | Jan. 3, 2011 |
| 38. | Dean Heller, R-NV | May 9, 2011 |
| 39. | Tim Scott, R-SC | Jan. 3, 2013 |
| 40. | Jeff Flake, R-AZ | Jan. 3, 2013 |
| 41. | Ted Cruz, R-TX | Jan. 3, 2013 |
| 42. | Deb Fischer, R-NE | Jan. 3, 2013 |
| 43. | Shelley Moore Capito, R-WV | Jan. 3, 2015 |
| 44. | Bill Cassidy, R-LA | Jan. 3, 2015 |
| 45. | Cory Gardner, R-CO | Jan. 3, 2015 |
| 46. | James Lankford, R-OK | Jan. 3, 2015 |
| 47. | Tom Cotton, R-AR | Jan. 3, 2015 |
| 48. | Steve Daines, R-MT | Jan. 3, 2015 |
| 49. | Mike Rounds, R-SD | Jan. 3, 2015 |
| 50. | David Perdue, R-GA | Jan. 3, 2015 |
| 51. | Thom Tillis, R-NC | Jan. 3, 2015 |
| 52. | Joni Ernst, R-IA | Jan. 3, 2015 |
| 53. | Ben Sasse, R-NE | Jan. 3, 2015 |
| 54. | Dan Sullivan, R-AK | Jan. 3, 2015 |
* Phil Gramm resigned early, effective Nov. 30, 2002, so that Cornyn could move into his office suite and begin organizing his staff. Cornyn did not, however, gain seniority, owing to a 1980 Rules Committee policy established by Senator Pell that no longer gave seniority to senators who entered Congress early for the purpose of gaining advantageous office space.