There are about half a million people with MS in the United States of America (=USA).

The common thought is that there are more people with MS that are not

counted for.

According to the National Multiple Sclerosis Society, there are an estimated 400,000, up from the 250,000 to 350,000 people estimated in the 1990s with MS in the United States.

It is estimated that approximately 2.5 million people suffer with MS worldwide.

There is a very high prevalence of MS in northern Europeans, especially in Sweden, Norway, Denmark, and Iceland. Australia, the British Isles, Canada, Ireland, New Zealand, and the United States also have comparatively high prevalence rates. Conversely, prevalence rates are relatively lower in Africa, China, India, Japan, and Southeast Asia.