I think Trulia pulls it's data from Google maps and I have seen sporadic mistakes but very few for a system so large. Trulia doesn't generate the data and there really isn't a way to fix it unless Google redoes that section of the map.
Is it a home listed for sale, or are you looking at the public records? If it's listed for sale, then the listing agent must correct it. But I suspect you're looking at a public records listing, and they often use Google maps, which isn't perfect.
But the big question i have for you is -- WHY does it matter to you?