Census of Population and Housing, 2000 [United States]
Study Number	S21_00
Background of Dataset
Purpose of the Data Set	Information on the population of the U.S. is collected every 10 years to assist in defining Congressional districts.
Criteria(s) for Inclusion/Exclusion	All persons and housing units in the U.S. were included.
Age Range Included	All
Method(s) of Data Gathering	Questionnaires were collected by mail or by canvassing neighborhoods.
Sampling Frame/Design	A limited set of questions were asked of every person and housing unit in the U.S. Additional questions were asked of a sample (generally 1 in 6) of persons and housing units.
Limitation(s) of Study
Year(s) Available	2000
Number of Observations	Varies with the unit of observation
Unit of Observation	Various geographic units including state, county, ZIP code tabulation areas, census tracts.
Publisher	U.S. Census Bureau
Contact Information/Web Address	http://www.census.gov
Condition of Use	A subset of the Census data is currently available in the data laboratory. Data laboratory staff can download additional data upon request and make it available to users in SAS format. Documentation about the detailed data (collected from a sample of households) is available in DCPM or on the web at http://www.census.gov/prod/cen2000/doc/sf3.pdf The limited data collected from every household is described at http://www.census.gov/prod/cen2000/doc/sf1.pdf Chapters 3 and 5 of the documentation describe the data in detail.
Contents of Database
Key Linking Variables
•Patient identifier
•Physician identifier
•Health facility identifier
•Geographic identifier	Many geographic identifiers, e.g., state, county, ZIP Code Tabulation Area, census tracts.
•Other identifier
Demographics Information
•Sex	Yes
•Race	Yes
•Geographic location	Yes
•Income	Yes
•Education	Yes
•Employment status	Yes
•Others	Housing characteristics.
Access/Utilization Information	N/A
Health Care Facility Information	N/A
Physician Information	N/A
Cost/Expenditure Information	N/A
Other Information
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