Statistics are published on the web and in print publications. Publishers include the federal government, state governments, foreign governments, international agencies, private entities, and membership organizations. Recording of statistics is sometimes mandated by law, but in other instances, it is entirely voluntary. Even required government statistics often change over the years. Statistics are not always published and raw data and data sets are not always accessible. Finally, there may be hefty fees for some statistics!
The best strategy for finding statistics is to identify the stakeholders (governments, companies, organizations) and do a thorough search of their publications and Internet pages. The resources below are good places to start you statistical research.