The 1978 United States Senate elections were held on November 7, in the middle of Democratic President Jimmy Carter's term. The 33 seats of Class 2 were contested in regular elections. Special elections were also held to fill vacancies.
The 1974 United States Senate elections were held on November 4, with the 34 seats of Class 3 contested in regular elections. They occurred in the wake of the Watergate scandal, Richard M. Nixon's resignation from the presidency, and Gerald Ford's subsequent pardon of Nixon. Economic issues, specifically inflation and stagnation, were also a factor that contributed to Republican losses. As an immediate result of the November 1974 elections, Democrats made a net gain of three seats from the Republicans, as they defeated Republican incumbents in Colorado and Kentucky and picked up open seats in Florida and Vermont, while Republicans won the open seat in Nevada. Following the elections, at the beginning of the 94th U.S. Congress, the Democratic caucus controlled 60 seats, and the Republican caucus controlled 38 seats.
The 1968 United States Senate elections were elections for the United States Senate. Held on November 5, the 34 seats of Class 3 were contested in regular elections. They coincided with the presidential election of the same year. The Republicans picked up five net seats in the Senate. This saw Republicans win a Senate seat in Florida for the first time since Reconstruction.
The 2014 United States Senate election in Iowa was held on November 4, 2014. Incumbent Democratic Senator Tom Harkin did not run for reelection to a sixth term in office.
The 2014 United States House of Representatives elections in Iowa were held on Tuesday, November 4, 2014, to elect the four U.S. representatives from the state of Iowa, one from each of the state's four congressional districts. The elections coincided with the elections of other federal and state offices, including Governor of Iowa and United States Senate. Primary elections were held on June 4, 2014. As no candidate won more than 35% of the vote in the 3rd district Republican primary, that nomination was decided at a party convention on June 21.
The 2016 United States Senate election in Iowa was held November 8, 2016, to elect a member of the United States Senate to represent the State of Iowa, concurrently with the 2016 U.S. presidential election, as well as other elections to the United States Senate in other states and elections to the United States House of Representatives and various state and local elections.
The 1924 United States Senate election in Iowa took place on November 4, 1924. Incumbent Republican Senator Smith W. Brookhart ran for re-election to a full term in office against Democrat Daniel F. Steck.
The 1938 United States Senate election in Iowa took place on November 8, 1938. Incumbent Democratic Senator Guy M. Gillette, who won a special election to complete the unexpired term of Richard Louis Murphy, won a full term in office by defeating Republican former Senator Lester J. Dickinson. Gillette and Dickinson had briefly served together in the final months of 1936.
The 1948 United States Senate election in Iowa took place on November 2, 1948. Incumbent Republican Senator George A. Wilson ran for re-election to a second term but was defeated by Democratic former Senator Guy Gillette.
The 1944 United States Senate election in Iowa took place on November 7, 1944. Incumbent Democratic Senator Guy M. Gillette ran for a second full term in office but was defeated by Republican Governor Bourke B. Hickenlooper.
The 2018 United States House of Representatives elections in Iowa were held on November 6, 2018, to elect the four U.S. representatives from the State of Iowa, one from each of the state's four congressional districts. The elections coincided with the gubernatorial election, as well as other elections to the House of Representatives, elections to the United States Senate, and various state and local elections. The state congressional delegation flipped from a 3–1 Republican majority to a 3–1 Democratic majority. The Democrats had last won the majority of Iowa's seats in the 2010 elections.
The 1922 United States Senate special election in Iowa took place on November 7, 1922. Republican Smith W. Brookhart was elected to complete the unexpired term of William S. Kenyon, defeating Democrat Clyde Herring.
The 1936 United States Senate election in Iowa took place on November 3, 1936. Incumbent Republican Senator Lester J. Dickinson ran for re-election to a second term but was defeated by Democratic Governor Clyde Herring.
The 1954 United States Senate election in Iowa took place on November 2, 1954. Incumbent Democratic Senator Guy Gillette ran for re-election to a second term but was defeated by Republican U.S. Representative Thomas E. Martin.
The 1960 United States Senate election in Iowa took place on November 8, 1960. Incumbent Republican Senator Thomas E. Martin did not run for re-election to a second term. Jack Miller won the open seat by defeating Democratic Governor Herschel Loveless.
The 1962 United States Senate election in Iowa took place on November 6, 1962. Incumbent Republican Senator Bourke B. Hickenlooper was re-elected to a fourth term in office over Democrat E.B. Smith.
The 1966 United States Senate election in Iowa took place on November 8, 1966. Incumbent Republican Senator Jack Miller was re-elected to a second term in office over Democrat E.B. Smith.
The 1968 United States Senate election in Iowa took place on November 5, 1968. Incumbent Republican U.S. Senator Bourke B. Hickenlooper retired. The open seat was won by Democratic Governor Harold E. Hughes, narrowly defeating Republican State Representative David M. Stanley.
The 1978 United States Senate election in Iowa took place on November 7, 1978. Incumbent Democratic Senator Dick Clark ran for re-election to a second term but was defeated by Republican former Lieutenant Governor Roger Jepsen. This was the last time until 2014 that a Republican would win Iowa's class 2 Senate seat.
The 2020 United States House of Representatives elections in Iowa was held on November 3, 2020, to elect the four U.S. representatives from the state of Iowa, one from each of the state's four congressional districts. The elections coincided with the 2020 U.S. presidential election, as well as other elections to the House of Representatives, elections to the United States Senate and various state and local elections.
