The U.S. Census Bureau is a great source for population, housing, economic, and geographic data. Its American FactFinder website can be difficult to search, so check out these tips. Here's some of the data available:
QuickFacts offer statistics on population, age, gender, ethnicity, homeownership, education, income, retail sales, and more.
Note: If a Pima County Public Library resource says it requires a library card to access it, refer to this course guide's Get started tab.
Business Statistics & Demographics
PCPL's extensive listing of sources for demographic and statistical business information.