I've reported this to various data aggregators, and haven't received a response back yet. Seems they're searching more by city name than by zip code, and thus things get all convoluted.
Do report your situation to Trulia to see if they can get it corrected for you. It may be that they don't have enough control over the data to make the change, but at least they can investigate.
Depending on who entered the listing on Trulia, it might be possible to contact the agent and have them either edit or delete and re-enter the listing.
Certain things such as schools are pulled from the internet and there is not much that can be done, but a fair amount of information is user added.
I hope this helps!
Keller Williams La Jolla
You can e-mail Trulia and provide, what you know, is the right info. As far as I know, these information published by most websites come from Dataquick so if there is a misunderstanding and you are right, I don't think Trulia will deny your request.