Bryant was appointed as State's Attorney in January 2019 following the appointment of the previous incumbent to a judgeship.

Stratemeyer was appointed as State's Attorney in January 2019 following the election of the previous incumbent to the state legislature.

Knapp was appointed as State's Attorney in August 2018 following the appointment of the previous incumbent to a judgeship.

This was a special election for the unexpired term. Grosboll was originally appointed as State's Attorney in June 2017 following the appointment of the previous incumbent to a judgeship.

Liefer was chosen by the Monroe County Republican Central Committee to run in the general election following the withdrawal of Ryan Martin from the race.

Martin withdew from the election after the primary election.

This was a special election for the unexpired term. No candidate filed for the Republican Primary.

This was a special election for the unexpired term. Hitchings was originally appointed as State's Attorney in August 2017 following the appointment of the previous incumbent to a judgeship.

Weaver was appointed as State's Attorney in late 2018 following the appointment of the previous incumbent to a judgeship.

Hobbs was appointed as State's Attorney in August 2019 following the death of the previous incumbent.

Olson was appointed as State's Attorney in April 2019 following the resignation of the previous incumbent.

Villareal Nieman was appointed as State's Attorney in July 2019 following the appointment of the previous incumbent to a judgeship.

This was a special election for the unexpired term. Primary election results are forthcoming. Clark was originally appointed as the State's Attorney in 2017 following the death of the previous incumbent.

This was a special election for the unexpired term. Primary election results are forthcoming.

Candidate Duebbert began their campaign after they were removed from a judgeship in January 2020 after a finding that he had lied to police and a judicial ethics board about a criminal investigation. Duebbert did not appear in the general election.

Gomric was appointed as the State's Attorney in January 2019 following the appointment of the previous incumbent to a position with the Illinois State Police.