List of members of the United States Congress by longevity of service House and Senate time House and Senate time

| Total_tenure_rank | Uninterrupted_rank | Name_ | Party_affiliation | Total_tenure_time | Uninterrupted_time |
|---|---|---|---|---|---|
| 15 | 13 | Adolph J. Sabath (H) | Democratic Party | 45 years, 247 days | 45 years, 247 days |
| 16 | 14 | J. Lister Hill (H,S) | Democratic Party | 45 years, 142 days | 45 years, 142 days |
| 17 | 15 | George H. Mahon (H) | Democratic Party | 44 years, 0 days | 44 years, 0 days |
| 18 | 16 | Warren Magnuson (H,S) | Democratic Party | 44 years, 0 days | 44 years, 0 days |
| 19 | 17 | Charles Edward Bennett (H) | Democratic Party | 44 years, 0 days | 44 years, 0 days |
| 20 | 18 | Justin Smith Morrill (H,S) | Republican Party | 43 years, 299 days | 43 years, 299 days |
| 21 | 999 | William B. Allison (H,S,I) | Republican Party | 43 years, 152 days | n/a |