The new edition of J. Gordon Melton's "Encyclopedia of American Religions" describes 2,630 U.S. and Canadian religious groups, categorized into 26 "families" of faith. These six families contain the largest numbers of distinct groups:
Pentecostal: 325
Spiritualist, Psychic, New Age: 224
Buddhism, Shintoism, Japanese New Religions: 212
Hinduism, Jainism, Sikhism: 170
Magick: 161
Eastern Liturgical (Orthodox): 147