Is there a single place in the US that uses Proportional Representation? Sometimes I wonder if Americans are even aware of its existence.
IRV is used in 13 cities, and STV is used in 2, although it used to be a larger number like CrabCake said. The only alternative system that has recently been successful is top-two primaries. Illinois used to have cumulative voting for its house of reps, but that was abolished in 1980. At least in my experience, most people don't understand proportional representation or are even aware of its existence, which makes the possibility of changing to any form of PR very slim. Democrats and Republicans conveniently ignore proportional representation because FPTP is what is ensuring their dominance as major parties.