It's not exactly Paris but the SF bay area is one of the best places in the US for walkability. Certainly much of SF, Berkeley, and Oakland are walkable (or at least were when I lived there in 2010!).

And if not walkable, bikable - I biked to a hacker space in Dublin (Ireland, not the BA one) for a while with zero parking but most people walked or biked there. A folding bike meant even less space was necessary.