In 2008, some 342,000 people identified themselves as Wiccans, up from 134,000 in 2001 and up significantly from 8,000 in 1990, said Barry Kosmin, a sociology professor at Trinity College, and the lead researcher of one of the largest surveys on religion in the U.S., the American Religious Identification Survey. But the number of Wiccans remains relatively small to the U.S. population, less than 0.3 percent, according to the Pew Forum for Religion and Public Life.