That’s according to Richard Florida, writing at

The 2011 edition of the Trick-or-Treater Index “is based on the following five metrics: the share of children aged 5 to 14; median household income (figuring the haul will be better in more affluent metros), population density, walkability (measured as the percentage of people who walk or bike to work) and creative spirit (which we measured as the percentage of artists, designers, and other cultural creatives).”

I get share of children, household income, population density, and walkability as relevant metrics, but creative spirit? Maybe the more clever the costume, the greater the treat haul.