New York City's lowest census return rate is in Williamsburg, a.k.a. the Haight Ashbury of Hipsterdom. Only 30 percent living in Brooklyn's coolest zip have managed to stagger their way to the post office.
(Apparently the skinny jeans arms race has reached its natural conclusion, which is a pair of denim so tight they restrict the wearer from making it down to the outgoing mail slot.)
Seattle also has a "too cool for school" contingent. And ironically, they're the ones still matriculating: according to this map, the University District is tied for the lowest return rate in the city. Clocking in at a 50 percent clip compared with 66 percent for Seattle as a whole.