Silver calculates that marriage equality states now “have a collective population of roughly 165 million, according to 2013 census figures”:
That means for the first time, same-sex marriage is legal for the majority of the U.S. population. The 26 states where the practice is not legal have a total population of about 151 million. The Supreme Court’s decision may also lead to the legalization of same-sex marriage in Colorado, Kansas, North Carolina, South Carolina, West Virginia and Wyoming. Those states have an additional 25 million people combined. If they follow suit, 30 states and the District, totaling about 60 percent of the U.S. population, would allow same-sex marriage.
Burroway charts the progress made since the 1960s – a reversal few ever imagined: