Question: What percentage of Mormons still practice polygamy? (Submitted by John)
Answer: Good question. The answer is 0%! None! This is a very commonly misunderstood issue. The Church strictly prohibits polygamy. Anyone that practices it is promptly excommunicated. There is much confusion on this issue because many groups that have broken off of The Church of Jesus Christ of Latter-day Saints practice polygamy today. Often the media does not distinguish clearly between the LDS Church and splinter groups.
For more on this topic see also Do Mormons Practice Polygamy?