If it's New Jersey, nearly half of all millennials, that's who.
The Northeast leads the way in percentages of millennials living at home, led by New Jersey (46.9 percent), Connecticut (41.6 percent), and New York (40.6 percent). All three states have high costs of living, including rent and/or house payments. In such areas, it simply makes sense for millennials to stay at home if that's an option.
Other areas with high costs of living, property values, and/or taxes have similarly high percentages of millennials living at home. Florida (38.3 percent), California (38.1 percent), and Illinois (36.5 percent) are primary examples. However, the Deep South shows a uniformly high rate of living at home — perhaps from a mixture of economic necessity and a culture more tolerant of generations living under the same roof.
I'm sure it's because they're shiftless, lazy, and spend all their money on avocado toast.
*note: title left at its soporific best because who DOESN'T live at home