Hey Solitar, you just keep coming up with fascinating numbers! I'm not sure I totally believe the Census figures (e.g., I have a hard time that 250k people will move to Alaska over the next 23 years -- that's 10k people a year), but they're better than nothing. I must say I'd be most comfortable with a state that will still be under 1 million people in 20 years or so, which according to your list would leave Alaska, Delaware, North Dakota, South Dakota, Vermont, and Wyoming (with Montana almost making the cut). Alaska continues to look better and better to me, but I think the short list really needs to take this kind of demographic information into account, so thanks for digging it up!