Demographics
Wiccan churches and other Neopagan institutions are becoming more common in the US. However, estimates of their numbers vary widely. Most of the 1990s studies put the number of US Neopagans between 200,000 and 1 million (0.1% to 0.5% of the total population). A 2008 Pew Forum survey put "New Age" religious believers, including Neopagans, at about 1.2 million.
According to David Waldron (2005), roughly 10 million Wiccan-related books were sold in 2000 (up from 4.5 million in 1990), as reported by the American Booksellers Association. However this gives only a rough guide to the size of the Wiccan-related economy and he comments that the added complexity of determining the boundary between Wiccan or Neopagan products and New Age products makes determining the size of the movement from this rather problematic.
More conservative estimates include Helen Berger and Craig Hawkins in Exploring the World of Wicca, who guessed from 150,000 to 200,000. Melton, J. Gordon, Jerome Clark and Aidan A. Kelly in New Age Almanac (1991, p. 340) estimate a total of about 300,000 people associated with the "overall movement" of Wicca, with "tens of thousands" of members active in between 1,000 and 5,000 covens. Conservative estimates arrive at about 50,000 Wiccans in the US (Religious Requirements & Practices of Certain Selected Groups: A Handbook for Chaplains, 1993) while Wiccan high estimates claim several million (Phyllis Curott, The Book of Shadows: A Modern Woman's Journey Into the Wisdom of Witchcraft and the Magic of the Goddess). The largest estimates posit 1 million Wiccans, a fast growth compared to the 100.000/200.000 estimated in late 1990s and early 2000s.
Read more about this topic: Neopaganism In The United States