You have to click through based on what part of the county you are trying to track to get individual zip codes.
Also, if anyone is interested, I’ve started a thread on SDLookup’s forums concerning differences between Dataquick’s numbers and other’s numbers for La Jolla.
But I’d welcome anyone who has the energy to check other zips numbers to join in too! I’m not much for conspiracy theories, but I find that Dataquick’s numbers are always higher than any body else. I’d love to hear any good explanations of why.