From January 1 through December 21, 2023, Ballotpedia tracked 20 state supreme court vacancies. This was the second-lowest number of vacancies since Ballotpedia started tracking state supreme court vacancies in 2019.

Of the 20 vacancies, 13 (65%) were caused by a justice resigning from their seat. Of the 13 retirements, seven (54%) were voluntary, with the justices leaving for various reasons. The remaining six (46%) were triggered by mandatory retirement ages across four states.