Instant-runoff voting - its use internationally

Here is table rescued from Wikipedia cutting-room floor (deleted as of June 4, 2025):

National level elections

Country	Body or office	Type of body or office	Electoral system	Total seats	Notes
Australia	House of Representatives	Lower chamber of legislature	Instant-runoff voting	150
Ireland	President	Head of State	Instant-runoff voting
Dáil Éireann	Lower chamber of legislature	Single transferable vote (STV), by-elections using Instant-runoff voting	174[64]
Papua New Guinea	National Parliament	Unicameral legislature	Instant-runoff voting	109
United States	President (via Electoral College)	Head of State and Government	Alaska and Maine use IRV to select the state's electoral college seat winner or winners. In Maine, 2 electors are allocated to the winner of the state vote plurality and the others (currently 2) are allocated by plurality in each congressional district. In Alaska, the winner receives all Electoral College electors of the state (as Alaska has only one at-large district, the effect is the same).	7 EVs[65] (out of 538)
House of Representatives	Lower chamber of legislature	IRV in Maine In Alaska -- Nonpartisan primary system with IRV in the second round (to choose from top four candidates)	3 (out of 435)
Senate	Upper chamber of legislature	4 (out of 100)

R

Also IRV is used in some U.S. cities

San Francisco

see

"How San Francisco's IRV works..."

https://www.sfgate.com/politics/article/san-francisco-ranked-choice-voting-how-it-works-19842049.php

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Although IRV attempts to ensure that the winner Ina single-winner contest is elected with majority of votes, in actuality often something less than half of votes cast elects the winner.

The proportion of votes used to elect the winner under IRV is guaranteed to be about half at minimum.

Meanwhile, under proportional representation systems (STV, list PR and MMP), the rate of effective votes is commonly in the 80 to 90 percent range.

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