Canadian GeoData does not have post codes (they are owned by the post office I think, and the last I checked could not be obtained en masse for free - let me know if you find otherwise).
Depending on your Map This! version (some later ones allow more relaxed search) try different parts of an address (for example 100 king or 100 king st or 100 king st west etc. for 100 king st west, toronto, ontario...)
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