[eschaton]

Minneapolis probably has the best walkable environment overall given the large amount of recent infill, but the historic built vernacular of the city outside of its apartment districts (wood-framed detached houses) isn't very urban feeling, which leads to the same sort of schizophrenic feel as Seattle on a smaller scale.

Cincinnati has the single most urban neighborhood in the Midwest outside of Chicago (Over-the-Rhine) but it falls off pretty dramatically in terms of urbanity after that.

St. Louis has a truly massive area of moderate levels of urbanity/walkability, but the urban renewal era (and white flight) took a heavy toll on its historic fabric.