Get ready to fill those pillowcases with sweets. The data heads at Zillow have taken a break from churning out serious research briefs and Real Estate Market Reports to rank the 20 best cities to trick or treat this Halloween. Now in its third year, the Zillow Trick-or-Treat Index is designed to help kids (and parents) use data to identify cities that will boost their Halloween haul. San Francisco was named 2011's best city to trick or treat, followed by Boston, Honolulu, Seattle, and Chicago. In total, nine of the top 20 cites were located in the West. Behold, the list. Since trick-or-treating is an inherently hyperlocal experience, we've also ranked the top five neighborhoods to trick or treat in each of the top 20 cities. Click on the city name below and you'll find a chart outlining the local results (on the right hand side of the page).

1. San Francisco
2. Boston
3. Honolulu
4. Seattle
5. Chicago
6. San Jose
7. Washington
8. Los Angeles
9. Philadelphia
10. Portland
11. Minneapolis
12. Pittsburgh
13. San Diego
14. Cleveland
15. Miami
16. Denver
17. Milwaukee
18. Virginia Beach
19. Baltimore
20. Albuquerque

Don't see your favorite Halloween hot spot on the list? Take a minute to comment on this post and tell us why trick or treating is special in your community. Methodology: The Zillow Trick-or-Treat Index is calculated using four equally weighted data variables: Zillow Home Value Index, Walk Score, population density, and local crime data from RelocationEssentials.com. >>See 2009 and 2010 Trick-or-Treat Index results