Web Searching Tips
Calculations:
U.S. Census Bureau: American FactFinder
Population, housing, community, economic and geographic data from U.S. Census Bureau's surveys and censuses.
ERIC (Education Resources Information Center)
The world's largest source of education information, with more than 1 million abstracts of documents and journal articles on education research and practice.
Do not forget to check the "About" sections of these websites...