https://en.wikipedia.org/wiki/Seniority_in_the_United_States_Senate

United States senators are conventionally ranked by the length of their tenure in the Senate. The senator in each U.S. state with the longer time in office is known  ...

https://en.wikipedia.org/wiki/List_of_United_States_Senators_in_the_115th_Congress_by_seniority

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.

https://en.wikipedia.org/wiki/List_of_United_States_Senators_in_the_116th_Congress_by_seniority

This is a complete list of United States senators during the 116th United States Congress listed by seniority, from January 3, 2019, to January 3, 2021.

https://www.periodicalpress.senate.gov/seniority/

For senators who entered the Senate on the same day, several tie-breaking procedures determine seniority. In order of precedence, these factors are: previous ...

https://www.senate.gov/reference/Sessions/Traditions/Seniority.htm

The concept of seniority in the Senate developed through the institution's first half -century. In its earliest decades, the Senate struggled to find an equitable ...

https://www.senate.gov/reference/glossary_term/seniority.htm

seniority - The status given senators according to their length of service, which entitles a senator with greater seniority to preferential treatment in matters such as ...

https://www.washingtonpost.com/powerpost/senates-seniority-rules-raise-questions-when-presidential-succession-is-at-stake/2018/09/22/d65001d2-bdc6-11e8-be70-52bd11fe18af_story.html

Sep 22, 2018 ... Depending on what party wins the majority, either 85-year-old Grassley or 78- year-old Leahy would be the Senate's pro tempore — and in the ...

https://constitution.laws.com/senate/seniority

The United States Senate has a system of seniority in place in regards to its members. There are several factors considered to determine seniority, but the ...

https://apps.senate.virginia.gov/Senator/seniority.php

Seniority shall be based upon longest continuous service in the Senate. However , if a Senator has previous interrupted service in the Senate, then the beginning ...

http://www.auburn.edu/~johnspm/gloss/seniority

Seniority (of a US Representative or Senator). The number of years of unbroken service that a member of a standing Congressional committee has on that ...