Senators were elected over a wide range of time throughout 1890 and 1891, and a seat may have been filled months late or remained vacant due to legislative deadlock.

In November, Fred Dubois helped engineer a plan for the Idaho Legislature to effectively elect three people to the U.S. Senate: Governor George Shoup to the class 2 seat up for election in 1894, state constitutional convention member William J. McConnell to serve for the remainder of the Fifty-first United States Congress, ending in March 1891, and Dubois himself to succeed McConnell and serve a full six-year term in the class 3 seat beginning in March 1891.

Ephraim King Wilson II was re-elected by an unknown margin of votes, for the Class 3 seat.

Republican William M. Evarts had been elected to this seat in 1885, and his term would expire on March 3, 1891.

Governor Hill was elected by a majority of 2, every member of the Legislature being present.

David B. Hill remained in office as Governor of New York until December 31, 1891, and took his seat only on January 7, 1892, missing actually only one month of session.

J. Donald Cameron was re-elected by the Pennsylvania General Assembly to the United States Senate.

[15] The Pennsylvania General Assembly, consisting of the House of Representatives and the Senate, convened on January 20, 1891.