According to the American Podiatric Medical Association, three of the 10 best U.S. cities for walking are in the Northwest:  Seattle (#3), Portland (#4), and Eugene, OR (#8).  Other cities in the top ten, in order, were Arlington, VA; San Francisco; Boston; Washington, DC; New York City; Jersey City; and Denver. The APMA ranking is based on a number of measures of physical activity, ranging from dog ownership to the share of people who go to museums. 

Obviously, to some extent, lists like this are a bit silly—they project an appearance of precision that just isn’t justified.  But on the other hand, maybe living in a walking-friendly city will make up for all of those donuts that I eat.