This is interesting: USC urban planning professor Geoff Boeing examined the street networks of 100 world cities as a measure of their spatial logic and order.
The cities with the most ordered streets are Chicago, Miami, and Minneapolis; most disordered are Charlotte, São Paulo, and Rome.
“On average, US/Canadian study sites are far more grid-like than those elsewhere, exhibiting less entropy and circuity.”
(Geoff Boeing, “Urban Spatial Order: Street Network Orientation, Configuration, and Entropy,” Applied Network Science 4:1 , 1-19.) (Via Ethan Mollick.)