The 1990 United States Senate elections were held on Tuesday, November 6, 1990, with the 33 seats of Class 2 contested in regular elections. Special elections were also held to fill vacancies. The Democratic Party increased its majority with a net gain of one seat from the Republican Party. The election cycle took place in the middle of President George H. W. Bush's term, and, as with most other midterm elections, the party not holding the presidency gained seats in Congress. Until 2022, this had been the only election cycle where only one U.S. Senate seat flipped parties.
The 2008 United States Senate election in Illinois was held on November 4, 2008. Incumbent Democratic U.S. Senator Dick Durbin sought a third term in office and faced minimal opposition from Republican Steve Sauerberg. As expected, Durbin overwhelmingly won re-election. On the same night, fellow Democratic Senator Barack Obama was elected President of the United States, defeating Republican Senator John McCain of Arizona.
The United States Senate election in Illinois was held on November 5, 2002. Incumbent Democratic U.S. Senator Dick Durbin sought re-election to a second term in the United States Senate. Durbin defeated Republican challenger State Representative Jim Durkin in a landslide.
The 1996 United States Senate election in Illinois took place on November 5, 1996. Incumbent Democratic U.S. Senator Paul Simon chose to retire rather than seek a third term in office. In the Democratic primary, U.S. Representative Dick Durbin emerged victorious, while state representative Al Salvi won the Republican primary. Though the election was initially anticipated to be close, Durbin ended up defeating Salvi by a comfortable double-digit margin of victory, allowing him to win what would be the first of several terms in the Senate.
The 1984 United States Senate election in Illinois took place on November 6, 1984. Incumbent Republican Senator Charles H. Percy ran for re-election to a fourth term in the United States Senate. Senator Percy was opposed by Democratic nominee Paul Simon, who was a United States Congressman from Illinois's 22nd congressional district. The campaign between Percy and Simon was contentious and brutally fought, and ended up with Simon ousting Percy by fewer than 90,000 votes, which was, at the time, considered an upset. Incidentally, Percy's son-in-law Jay Rockefeller was elected Senator from West Virginia in the same election cycle.
The 1978 United States Senate election in Illinois took place on November 7, 1978. Incumbent Republican United States Senator Charles H. Percy ran for re-election to a third term in the United States Senate. Percy was opposed by Democratic nominee Alex Seith, an attorney who had been appointed to several local government positions.
The 1972 United States Senate election in Illinois took place on November 7, 1972. Incumbent Republican United States Senator Charles H. Percy sought re-election to the United States Senate. Percy was opposed by Democratic nominee Roman Pucinski, a United States Congressman from Illinois's 11th congressional district, whom he was able to defeat handily to win a second term. As of 2022, this was the last time a Republican was elected to the U.S. Senate from Illinois during a presidential election year, the last time an Illinois Republican won a Senate election by double digits, and the last time any candidate has swept every county in the state. This election was the fourth consecutive time in which a United States Senate election in Illinois took place two years after a previous United States Senate election in Illinois after 1966, 1968 and 1970.
The 1966 United States Senate election in Illinois took place on November 8, 1966. Incumbent Democratic United States Senator Paul Douglas, seeking a fourth term in the United States Senate, faced off against Republican Charles H. Percy, a businessman and the 1964 Republican nominee for Governor of Illinois. A competitive election ensued, featuring campaign appearances by former vice president Richard M. Nixon on behalf of Percy. Ultimately, Percy ended up defeating Senator Douglas by a fairly wide margin, allowing him to win what would be the first of three terms in the Senate.
The 1986 United States Senate election in Illinois was held on November 4, 1986. The incumbent Democrat U.S. Senator Alan J. Dixon won re-election to a second term. Until 2022, this was the most recent election in which an incumbent Senator won re-election to Illinois' Class 3 seat and was elected to more than one full term.
The 1980 United States Senate election in Illinois was held on November 4, 1980. Incumbent Democrat U.S. Senator Adlai Stevenson III decided to retire. Democrat Alan J. Dixon won the open seat.
A general election was held in the U.S. state of Illinois on November 4, 2014. All of Illinois' executive officers were up for election as well as a United States Senate seat, and all of Illinois' eighteen seats in the United States House of Representatives. Primary elections were held on March 18, 2014.
A general election was held in the U.S. state of Illinois on November 6, 2018. The elections for Illinois's 18 congressional districts, Governor, statewide constitutional officers, Illinois Senate, and Illinois House were held on this date.
The United States Senate election in Illinois of 1954 took place on November 2, 1954. Incumbent Democratic United States Senator Paul Douglas was reelected to a second term.
The 1960 United States Senate election in Illinois took place on November 8, 1960. Incumbent Democratic United States Senator Paul Douglas was reelected to a third term.
The 1962 United States Senate election in Illinois was held on November 6, 1962 to elect one of Illinois's members to the United States Senate. Incumbent Republican U.S. Senator and Minority Leader Everett Dirksen won re-election to his third term.
The 1974 United States Senate election in Illinois took place on November 5, 1974. Incumbent Democratic U.S. Senator Adlai Stevenson III, who was first elected in a special election in 1970, was re-elected to a full term in office, defeating Republican George Burditt by a large margin of nearly 800,000 votes. This election was the fifth consecutive time in which a United States Senate election in Illinois took place two years after a previous United States Senate election in Illinois after 1966, 1968, 1970 and 1972.
Elections were held in Illinois on Tuesday, November 6, 1990. Primaries were held on March 20, 1990.
Elections were held in Illinois on Tuesday, November 3, 1992.
Elections were held in Illinois on Tuesday, November 6, 1984.
Elections were held in Illinois on Tuesday, November 7, 1972.
