So after seeing some post about possible locations I decided to take a look and see what I came up with and I think I have the right spot. Knowing that vault 76 is supposed to be near DC I looked up what the DC metro area is. I found all the counties that are included (Map of DC Metro Area) and 1 stuck out. Jefferson County, West Virginia. What really makes me almost sure of this is that they chose "Take me home, Country roads" for the teaser trailer song and this is the only county in West Virginia that the Shenandoah River and Blue Ridge Mountains run through. Then there is a leak (don't know what it is exactly I've only seen comments mentioning it) that apparently talks about a highway and US Highway 340 runs right through Jefferson County. I'm sure there are other clues but these one make me feel really good about this county being the right area. What do you all think?