I want to live somewhere affordable in the US where I can walk everywhere! What neighborhoods in which cities are the most walkable?

Looking for a walkable place to live that is also affordable. I am trying to stay away from generally expensive cities (NY, DC, SF, etc) so if you must recommend them make sure they are affordable neighborhoods (as in, not paying more than 600 for rent).

Walkable can be defined as being able to walk to most places: The bars, the grocery store, the restaurants, the coffee shop, the movies, etc.