A:
Instant runoff elections are used throughout the states of Alaska and Maine, at local option in cities in Utah, Colorado, and Virginia, and in multiple other U.S. cities for local nonpartisan elections. It was implemented in the largest U.S. city (New York) in 2021. It is used for Special Elections in Hawaii. In the 2024 presidential primaries, it was used in five states for the Democratic Party and by the Maine and Virgin Islands GOP. In addition, instant runoff voting has been used in government-run primaries in New York City and Maine and in party-run primaries in Virginia and Utah. It is used by various state Republican and Democratic party organizations for their internal elections. It is also used in countries around the world.
