How many people worldwide have williams syndrome?

Estimate is:: 1 per 7, 500 to 20, 000 people suffer from williams syndrome. Thus, it is listed as a "rare disesase" by office of rare disease (ord) and national institutes of health (nih).

William's Syndrome: Quoting again from: http://www.Williams-syndrome.Org/what-is-williams-syndrome, "ws affects 1 in 10, 000 people worldwide – an estimated 20, 000 to 30, 000 people in the United States. It is known to occur equally in both males and females and in every culture.".