What is Demographic Information?
Demographic data, or simply demographics, refers to things about people that can be objectively counted and verified. While race/ethnicity, gender, income and age are major demographic categories, this can also includes things like educational attainment and ways of getting to work.
The primary source of this kind of data in this country is the US Census.
Remember, demographics doesn't capture the beliefs or attitudes of those populations--that's psychographics.
Cornell college students
Middle class Ithaca working residents who commute
Disabled residents who do not drive