List of United States senators in the 9th Congress

This is a complete list of members of the United States Senate during the 9th United States Congress listed by seniority, from March 4, 1805, to March 3, 1807.

he order of service is based on the commencement of the senator's first term, with senators entering service the same day ranked alphabetically.

The two main parties in the 9th Congress were the Federalists (F), and Democratic Republicans (DR).