There is this interesting website called walkscore.com which uses afaiu google maps data to find distances along roads and such from a selected point to basic a

There is this interesting website called walkscore.com which uses afaiu google maps data to find distances along roads and such from a selected point to basic amenities, then it calculates a score for driving, walking, and biking. It's a little difficult to find on that website but on some page there is a heatmap of precalculated walkability scores overlaying google maps. If you just scan around on that thing you may get an idea about the walkability of various US cities. That should be correlated with the stroadedness / strongtownedness of those cities