12/01/2010 03:52 pm ET | Updated May 25, 2011

Colorado's Brainiest Major Cities, According To Portfolio (PHOTOS)

Boulder, Colorado is the brainiest city in the country, according to Portfolio Magazine, which released its ranking of America's major population centers on Tuesday.

Portfolio based its rankings around census data on relative levels of education. A higher "Brainpower Index" means a more educated population and--in Portfolio's book--a "brainier" city.

By those standards, Boulder is decisively the brainiest city in the country, with a Brainpower Index of 3.941. That's significantly higher than the next highest index (3.228), which belongs to Ann Arbor, Michigan.

Overall, Colorado fared extremely well in the study, with four cities rated in the top 25, among the 200 largest markets in the country).

Check out which Colorado cities did well, and let us know whether you buy Portfolio's rankings