Photo: Tracy O / Flickr
The Payscale list focuses solely on students who hold no degree higher than a bachelors. Thus, you won't find dentists, doctors, professors, lawyers or MBAs on the list.
A caveat on this topic -- I always advise students to major in the subject for which they have the most passion. Earnings and your financial and personal success are directly connected to how much passion you have for what you are doing.