You can search for an address on 411's website, 411.ca. The site provides options to either search for an entity's address by entering the entity name or to search for the entity by entering the entity address.
On the 411 home page, enter the search terms in the search box. To refine your search and present relevant results, you should choose Business or Person from the tabs listed above the search box. Alternatively, you can select Reverse. Reverse lookup allows you to find the name of the person or business entity by entering the already known address and phone number. The search results then match the address with that particular entity.