You can start with the Data and Statistics Guide, or check out other relevant subject guides. Many of these guides list statistical sources relevant to the subject area.
Consider where data may have originated or been reported to (the city, the federal government, an organization, etc.) and seek those sources directly (websites, reports, etc.).
e.g. if you're looking to find out how many public transit riders the Toronto Transit Commission had in a certain year, you would likely visit the City of Toronto website.
Look for organization or association websites related to your data, as these sources are likely to report on relevant data or conduct research in the topic area.
You'll probably find these just with some quick Google searches, but you can try more advanced searching techniques.
Do a web search for your topic along with words like "open data" or "statistics".
Look for published articles and news on your topics as these may include data. Do your best to follow up on sources mentioned in the article.
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