How many people read comics?

There haven't really been any major surveys to find out just how many people read manga. One would guess that in Asian countries, especially Japan, manga is read by a large portion of the population, while in Western countries such as America and the United Kingdom, the number of manga readers would be much smaller.

If you want to get an idea of how many people in your area read manga, you could stand in a public place, such as a park or sidewalk (make sure you have permission to be there!) and ask people that or similar questions.