This week, the District of Columbia's city council introduced a bill that would authorize same-sex marriages within its boundaries. According to the Associated Press, the measure "appears unstoppable"—garnering support from most council members, the mayor, and a lack of opposition from the Democratic Congress. Depending how you count, that would make D.C. anywhere from the fifth to the eighth U.S. jurisdiction to legalize gay marriage. Click through this TNR slideshow for a rundown on the places where same-sex marriage is legal, potentially legal, and no longer legal.