Decennial Census, Summary File 3 sample data (U.S. Census Bureau)
Every 10 years, the U.S. Census Bureau conducts a national household survey, producing the richest source of nationally available small-area data. The federal government uses Decennial Census data for apportioning congressional seats, for identifying distressed areas, and for many other activities. Census data are collected using two survey forms: the short form and the long form. Short form information is collected on every person and includes basic characteristics, such as age, sex, and race. The long form is sent to one out of every six households and collects more detailed information, such as income, housing characteristics, and employment. Most of the indicators in DataPlace are from the long form and thus are estimates based on the sample of households. These values may differ considerably from the same indicators based on the short form data, particularly for small areas. For more information, visit the Census Web site at http://www.census.gov/main/www/cen2000.html.