I have never heard of Google using geographic numbers to match to the name of a location.
The best way to rank for a country would be to add the address and the contact details at the footer. Say if I wanted to do a certain address:
11 Downing Street, London, England (UK) SW1A 2AA
or
11 Downing Street, London, England, United Kingdom, SW1A 2AA
In England, people are more likely to search for terms like "web design UK" as to "web design England". I don't think this would be the case for Canada, as "web design ca" doesn't really roll of your tongue. Do some keyword research on it
On the other hand, if you have multiple locations such as shops, I would do a store finder on your site and list information for that store on that page and optimise it around that content on the page. I would do it by adding a picture of the shop frontage with the address. I would then add information as to what they sell and what brands they supply. You could write directions, include a map and a brief description of what's inside the store.
Still include a contact page. People will find it easier to contact your business as to doing a store finder.
However, it is worth submitting your site to
Google Business Centre. You submit data about your business and Google integrates this with Google Maps , Google Local and maybe Google Earth. With universal search I have seen business contact details listed beneath the description or sometimes a link to Google Maps to allow the person get directions to your business. You can add multiple offices/locations if you wish.