List of United States Senators from Illinois
Overview
Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...

was admitted to the Union on December 3, 1818, and has been represented in the United States Senate by 47 senators. Senators from Illinois are elected to Class 2 and Class 3.

The Senate twice refused to seat Frank L. Smith
Frank L. Smith
Frank Leslie Smith was an Illinois politician. He served as a United States Congressman from 1919 to 1921. He was elected by the people of Illinois to the United States Senate in 1926, but the Senate never allowed him to take his seat.He first ran for the Republican nomination for the U.S....

, in December 1926 for an appointed term and in March 1927 for an elected one, due to corruption, but he is included in this list because Smith and the Governor considered him to be a senator for approximately two years.

Three of the four African Americans to hold U.S.
 
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