vacancy rates for smaller towns (quebec especially)

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Hello, its fairly easy to find vacancy rates for large cities and towns like Montreal and Sherbrooke, but i'm having difficulty finding the rates for smaller areas with populations under 5-10k (for example, Windsor, Quebec seems to have some good multi-family deals, but i can't find a vacancy rate anywhere). 

does anyone know where to find vacancy rates for small towns, or how to best approximate them? should i contact directly realtors who are working in these towns? thanks,