[ghaff]

I assume it's related to the fact that New Hampshire has more industry than Vermont (concentrated near the Mass border).

But, honestly, as I said in another comment, I'm not sure how much these numbers mean. With respect to to the MA negative numbers, if you've been anywhere near the Boston/Cambridge area recently the idea that there's this mass net exodus of people is pretty silly. Certainly if you've looked at Boston Metro real estate prices or the construction going on in the Seaport or around Kendall Square.

EDIT: It may also be related to MA people living in NH for tax reasons.

[wyldfire]

> mass net exodus of people is pretty silly

Well not necessarily "mass" (pun intended?) but -2% from 2000 to 2015. Note that everyone who moved from other cities in Massachusetts to Boston (and Boston burbs) are considered neutral by this metric. And there's always bound to be graduates of those Boston universities headed for the other coast. Also note that things are very different in Boston and elsewhere in 2016 from how they were in 2000.