38th United States Congress

The 38th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in Washington, D.C., from March 4, 1863, to March 4, 1865, during the last two years of President Abraham Lincoln's first term in office. The apportionment of seats in the House of Representatives was based on the 1860 United States census. The Senate had a Republican majority, and the House of Representatives had a Republican plurality; Republicans controlled the House by sharing a coalition with Unconditional Unionists.

The Confederacy fielded armies and sustained the rebellion into a second Congress, but the Union did not accept secession and secessionists were not eligible for Congress. Elections held in Missouri and Kentucky seated all members to the House and Senate for the 38th Congress. Elections held among Unionists in Virginia, Tennessee and Louisiana were marred by disruption resulting in turnouts that were so low compared with 1860, that Congress did not reseat the candidates with a majority of the votes cast.

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. Changes resulting from subsequent replacements are shown below in the "Changes in membership" section.

During this Congress, two seats were added for each of the new states of Nevada and West Virginia, thereby adding four new seats.

Before this Congress, the 1860 United States census and resulting reapportionment changed the size of the House to 241 members. During this Congress, one seat was added for the new state of Nevada, and three seats were reapportioned from Virginia to the new state of West Virginia.

This list is arranged by chamber, then by state. Senators are listed by class, and representatives are listed by district.

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. In this Congress, Class 1 meant their term began in this Congress, requiring reelection in 1868; Class 2 meant their term ended in this Congress, requiring reelection in 1864; and Class 3 meant their term began in the last Congress, requiring reelection in 1866.

The count below reflects changes from the beginning of the first session of this Congress.