How common is huntington's disease?

5-10/100,000. Huntington's disease is a progressive neurodegenerative disease that is autosomal dominant. Most estimate that it occurs in 5-10 per 100, 000 population. There does not appear to be any sexual discrimination. It is a progressive disease that usually becomes manifest in patients 30-40 years old.
Not very common. Iin the US, there are 4-8 cases per 100, 000 people.