Although only one county in the state, Essex, went for Trump--which is in the extreme northeast of the state and, unsurprisingly, is the poorest county in the state.
I guess the basic algorithm for finding the most rural progressive places in the US would then require selecting the most rural liberal counties[1] that are also in liberal-led states.
[1] https://upload.wikimedia.org/wikipedia/commons/thumb/d/da/20...