I think it would be nice if you could choose how many numbers in the zip code. For instance, here 04412 limits you to Brewer where if we could get 044, it would show more pharmacies. Then ri would give you that list of Rite Aids in the area, and you would be all set.
I tend to ask them what pharmacy and then choose the zip as most are memorized. Or put the town, and it usually is there. This isn't true with a Boston or Las Vegas.
