Walk Score put together a list of the country's top transit cities, based on the company's transit scores for more 1 million locations in the largest 25 cities with open public transit data. (Lack of data meant Atlanta and Phoenix were left out.) And, surprisingly, four out of the top five are on the East Coast: New York (No. 1), Boston (No. 3), D.C. (No. 4), and Philadelphia (No. 5).
San Francisco (of course!) is the one West Coast spoiler. (You can check out the full list is below the jump.)
I was surprised to see Boston and, in particular, Philadelphia come out on top of cities like Chicago and Seattle that I think of as public-transit friendly. One interesting wrinkle in the Walk Score methodology is that it measures not just the extent of public transportation but its "usefulness."