There are many more postal codes in Canada than you have zip codes in the US, so it makes it impossible to manage and for that we don't have an easy way to use postal codes for specific inspectors.
My idea is to use only the first 3-character prefix, rather than the full postal code. "M6S," rather than "M6S 3T1," which could make it more manageable. That said, there are still A LOT of postal codes, even with when limiting it to the 3-character prefix
Isolating by city or region would be even better!