Cambridge, Massachusetts has used the at-large form of ranked choice voting, an American form of proportional representation, to elect its City Council and School Committee since 1941. Cambridge adopted ranked choice voting at a time when more than two-dozen cities across the United States, including New York, Cincinnati, and Cleveland, used RCV to elect city councils and other positions in local government. Many of the cities that adopted RCV in that era did away with it due to changes in voting technology and the increased ability of racial minorities to get elected under RCV, but the system remains in Cambridge. For a wealth of detail on the history of Cambridge RCV use and its impact on proportionally representing the voices of racial minorities, read this spotlight by FairVote.
However, Cambridge is not the only place in Massachusetts where RCV is used. Many colleges and universities - including Harvard, MIT, Tufts, Northeastern, Clark, UMass Amherst, WPI, and Williams - also use RCV or variants of it for electing members of student councils, faculty committees, alumni associations, and other important offices.
In the United States
Nineteen states currently use (or are in the process of adopting) RCV at state and local levels. Click here for a full list, including dates of adoption.