The ranks of the religiously unaffiliated — or religious “Nones” — have tripled since the early 1990s, now accounting for 24 percent of the U.S. adult population, according to a new survey by the Public Religion Research Institute (PRRI).

Young adults are significantly more likely than older Americans to eschew religion. As Millennials come of age, 38 percent of those ages 18 to 29 are now unaffiliated (compared to 29 percent of Americans in their 30s; 23 percent of those in their 40s; 18 percent of those in their 50s; 16 percent of those in their 60s; 12 percent of those in their 70s; and 8 percent of those age 80 or older).

The unaffiliated claim 41 percent of the adult population in Vermont.

Nearly 6 in 10 (58 percent) of religiously unaffiliated Americans identify as secular; 14 percent claim to be atheists, and 13 percent identify as agnostic. Just 16 percent of the unaffiliated say they are religious people.

PRRI identified 20 states in which no religious group comprises a larger share of the adult population than the religiously unaffiliated. The unaffiliated claim 41 percent of the adult population in Vermont and at least a third of the residents in Oregon, Washington, Hawaii, Colorado and New Hampshire.

Nearly half (46 percent) of Americans identifying as LGBTQ are religiously unaffiliated.