Marketing and Intellectual Property: Demographics

The Bureau of the Census recently published this marvel of demography: Race & Ethnicity Across the Decades, 1790 - 2010

QuickFacts from the American Factfinder
Find census data by state, county or metro area for population, income, education and more. You can download the tables into Excel.

Statistical Abstract of the United States
Provides top-line data on a wide range of topics including population, household income, household spending, inflation rates, and much more. 

ProQuest
Contains many marketing, management, and demographic journals, often full-text. Try searching for the name of the company or product and anding it with words like advertising or demographics.