Good news: Elections Ontario makes the postal code/electoral riding data file available:
The Postal Codes by Electoral Districts (ED) file provides a link between the six-character postal code and Ontarioâ€™s new provincial electoral districts. It is a zip file containing three files that can be loaded and used in spreadsheets and databases. The first is a text file with the ED names; the second file contains the postal codes that have been assigned to a single ED; and the third file contains postal codes that have been found in multiple EDs. This third files repeats the postal code for each ED in which it is found.
Have not looked at it yet: any comments about formats/license etc?
(from the civicaccess.ca mailing list).
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