I love these list and have been to all of the cities except Minneapolis, therefore would tend to agree with the below. The ratings were gathered by Walk Score a very cool website, that you can map your commute, rate your walking neighborhood and in fact real estate agents are using. (my neighborhood is rated a 5)
What is really cool is checking out 2500 cities and neighborhoods with walk scores. Even better, take a walk and pick up some trash and litter.
Here are the 10 most walkable cities of the largest 50 in the U.S.:
1. New York City
2. San Francisco
3. Boston
4. Chicago
5. Philadelphia
6. Seattle
7. Washington D.C.
8. Miami
9. Minneapolis
10. Oakland
Here are the 10 least walkable of the 50 largest U.S. cities:
41. Louisville
42. Memphis
43. Kansas City
44. El Paso
45. Indianapolis
46. Nashville
47. Fort Worth
48. Oklahoma City
49. Charlotte
50. Jacksonville