Vermont is always putting a lot of pressure on New Hampshire. Okay that’s an old joke from Car Talk.

As everyone else said: it’s proximity to the eastern part of Massachusetts that increases population in southern New Hampshire.

Vermont (and far western Massachusetts) have lots of people from New York City. They can pay crazy high prices for real estate. They go back to the city for medical care. Some go as far as Vermont. But the whole Lenox/wolf trap area has events, some simulcasts from New York, to satisfy people who want to flee the city.