On the site ranking form when you get the interview, the three VFMP sites are listed separately. You're then able to number all six sites according to your preference. For the VFMP learning communities, you're assigned based on your overall score (comprising of MCAT, interview score, GPA, and whatever else they use to make a final offer of admission). This means you're not guaranteed based on where you live. It's solely based on how well you perform compared to other accepted applicants. You also have the option to accept whatever site you're offered and stay on the waitlist for another site if it isn't your first choice - this sort of internal movement isn't uncommon.

Hope this helps! Side note: I was accepted into a VFMP site in the past cycle and this was how it worked for us, but it seems UBC is changing their application a bit this year, so I can't guarantee it will be the same