To see just how politically polarized urban areas in the USA are, FiveThirtyEight used each American city’s 2016 election results to calculate its dissimilarity index – a number that tells us how separated its Republicans and Democrats are from one another, with higher numbers indicating more segregation. Those calculations generated this ranking of the country’s most politically segregated cities (click to enlarge).
Two-party vote margin for urban areas with the highest partisan segregation
