I've never heard of Westfall Village in Chapel Hill. Sounds like it's not actually in Chapel Hill, but is in Chatham Co — so that's probably why. There are some larger subdivisions in Chatham, like Briar Chapel, that have Chapel Hill postal address, but are not actually in Chapel Hill. Somebody on city-data explained it to me that they are served by the Chapel Hill mail carriers, but I don't know how that works. All I know is that addresses that are closer to Chapel Hill than Briar Chapel actually have a Pittsboro address. I know a lot of folks down that way.
There are some real estate websites where you can pick what schools you want. You can also go to
Chapel Hill-Carrboro City Schools - Homepage and look at the district boundaries.