When Did The First Legal Same-sex Marriage Occur?

When Did The First Legal Same-sex Marriage Occur? First same-sex marriage in U.S., May 17, 2004. On this day in 2004, Marcia Kadish, 56, and Tanya McCloskey, 52, of Malden, Massachusetts, were married at Cambridge City Hall — becoming the first legally married same-sex partners in the United States. When did the UK government legalized