Are you looking for datasets about Ontario?
The first place to look, other than the census and odesi, is the Ontario Data Catalogue. The Ontario Data Catalogue provides information about all of the datasets produced and maintained by all of the ministries and organizations in the Ontario government. You can get direct access to over 900 open datasets, as well as information about datasets that are under review or are restricted.
Topics include (but not limited to):
Do you need facts, figures, and statistics about Ontario?
Below is a list of data portals and statistical data sources by and about Ontario. Other data sources throughout the Data and Statistics guide will also have information about Ontario.