We added Kansas and South Carolina this week...at least, technically, although they are still kicking and screaming. Here's the map from ThinkProgress.
So, who's left?
A Federal Judge in Mississippi heard a case this week.
The 5th Circuit (TX, MS and LA) and 11th circuit (FL, AL, GA) have cases moving up from the states. Cases are pending in SD, ND, and NE and AR; these haven't had federal rulings yet or circuit decisions. MO is (like KS and SC) trying to resist the circuit ruling that applies. In Puerto Rico the case may be moving up to the 1st circuit. (All the states in the 1st have already got marriage equality.)
I will bet that we will have 50-state marriage equality by the summer of 2016. I think it is possible that the Supremes will hold off on a case this year.