This might be what you're looking for:
https://www.canadapost.ca/web/en/pro...and_rural_deli
I used "canada post householder counts and maps" as a google search.
There are full time CP employees who can help you in this area.
They can work depending on the product or service. You have to target a demographic and geographic area and keep track of response rates. Blanket mailings of huge areas without paying attention to the aforementioned factors can be expensive.
Its effective for targeting seniors, and special promotions in limited geographic areas.