This is a complete list of members of the United States Senate during the 107th United States Congress listed by seniority, from January 3, 2001, to January 3, 2003. Order of service is based on the commencement of the senator's first term. Behind this is former service as a U.S. senator (only giving the senator seniority within his or her new incoming class), service as U.S. Vice President, a House member, a cabinet secretary, a state governor, and then by their state's population, respectively.