From Wiki

Most residential properties that are for sale in Canada are published on the website of the Multiple Listing Service.

Canada Mortgage and Housing Corporation (CMHC), which is Canada's national housing agency, has a brilliant website with heaps of useful and well organised information about renting, buying and maintaining accommodation in Canada. It provides step-by-step guides that walk you through the renting or buying process, tell you how much it will really cost, and suggest which professionals you should call on.

There also are a number of articles in the BE Wiki section called Housing-Canada.

If you still are at very preliminary stage of your research, Statistics Canada provides heaps of information on different areas, population, age, average income, etc.