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Massachusetts - 55.7% Outbound Rate

Massachusetts, despite being somewhat small, has always punched above its weight when it came to population, but more people have been leaving the state in recent years. Housing and rent prices haven't helped. Those things have risen all over the country, but it's been especially hard for many in Massachusetts to afford a simple apartment. That said, the state is still home to some of the best universities in the country.

Wikimedia Commons/Jameslwoodward

So, it's no guarantee that its population will continue to decline. After all, it has lovely weather and scenery during most seasons, except for winter, and housing prices may flatten out.