The apportionment of seats in this House of Representatives was based on the 1860 United States census.

The count below identifies party affiliations at the beginning of the first session of this Congress, and includes members from vacancies and newly admitted states, when they were first seated.

Senators were elected by the state legislatures every two years, with one-third beginning new six-year terms with each Congress.

Preceding the names in the list below are Senate class numbers, which indicate the cycle of their election.

Following are external links to the pertinent volumes of the Globe, which are downloadable and/or searchable via Google Books and HathiTrust: The congressional debates pertaining to the Fourteenth Amendment can be found at “Congressional Debates of the Fourteenth Amendment to the United States Constitution”.