No. 1: San Francisco
Leave your heart in San Francisco this Halloween. The top city to trick-or-treat, as determined by Zillow, is the second most densely populated large city in the United States after New York City (and it's home to our POPSUGAR headquarters!).
If you're headed out with your tot for some trick-or-treating in San Fran, the best neighborhoods to check out are Presidio Heights, Sea Cliff, Noe Valley, Cow Hollow, and Lake.