From the U. S. Dept. of Labor, Bureau of Labor Statistics, provides data on expenditures, income, and demographic characteristics of consumers in the United States.
From the U.S. Census Bureau, FactFinder lets you zero in on a particular town, zip code, or "census tract"-- which might allow you to look at data for a neighborhood more accurately than zip code or city name.
The standard used by Federal statistical agencies in classifying business establishments for the purpose of collecting, analyzing, and publishing statistical data related to the U.S. business economy.