Demographics refers to statistics about populations. Governments tend to collect statistics about their populations, so those can be a good source for data. For example, the United States Census Bureau collects and shares all kinds of data. But not all governments collect or publicize data to the same degree, so it depends on context.
You can also find statistics within scholarly literature, so pay attention to any statistics you come across and track down where the researcher found them (or if the researcher generated the statistics through their own scholarship). The sources to the right are a good place to start.
Please reach out to a librarian for help, too. We enjoy helping you identify and track down statistics. Remember that if you google "demographics" to evaluate the site so you know what you're looking at and where the data originated. Librarians can help you vet sites, too, and are happy to take a look at what you've found.
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