For the 2009-2010 academic year, the most expensive school was listed as Bates College in Maine. The tuition at Bates is $51,300 however; this price includes fees and living expenses. If the price did not include those, it would not be ranked as the most expensive school. George Washington University is the most expensive university not including living expenses with tuition at $41,655. Penn State is also ranked as the most expensive public university with annual in-state tuition of $14,416.
Source: http://www.washingtonpost.com/blogs/college-inc/post/feds-unveil-list-of-most-expensive-colleges/2011/06/30/AGVGi9rH_blog.html