You are free to enter city or zip or neighborhood, depending on what makes the most sense for you. You can have up to 20 locations! Just go to your profile page and click on the edit personal info button.
hope it helps!
vicky (from trulia)
I tend to agree with Jed other than when there are cities with the same names but different locations / counties, then there should be some sort of identification to distinguish those.
I once answered a Saratoga contract question thinking it's CA contracts, but turns out to be FL questions - received a few TDs for an honest mistake :-)