Usually the governing body that oversees that industry will have tons of data. In the US, there is a governing body for everything, either a gov't department, or a similar organization. I'm not sure what type of data you need, but here's where I have gotten data to work with:

Population data - US Census (http://www.census.gov/main/www/access.html) Food data - USDA (http://www.ars.usda.gov/Services/docs.htm?docid=8964) SAT stats - College Board (http://professionals.collegeboard.com/data-reports-research/...)

I could go on and on...try a search for {subject} statistics and you should get some ideas