So, I finished the main quest and the dlc and I want to hit level 30 (in order to get all of the achievements), so being only level 26 i just set out in a random direction and killed everything I could find until i hit 27, but i got frustrated with how long it took. What I want is a list of all the areas where super mutants respwan every 72 hours so I can fast travel to those locations and turn in the blood samples for extra xp. I want a full and complete list, do not just say baileys crossroads and the mall.

Well, you could try Vault 87...they definitely seem to hang around on that hill. It's sorta highly irradiated, though...

Georgetown, Seward Square, Penn Ave, Mason District, Vernon Square, Takoma Park, L'Enfant Plaza, Falls Church, Clifftop Shacks, Mason Dixon Salvage

ah, thank you