The Decennial Census is actually two Censuses taken concurrently Census of Population (1790-present) counts numbers of persons and selected social & economic characteristics, the Census of Housing (1940-present) counts numbers of residential units and selected physical & financial characteristics. The Constitution states:
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A census is the gathering of data from an entire population.
The US Census is every 10 years.
Surveys are quick and census is more accurate.
information on the census was collected by enternet or by ask, Google,answers.com
Population is total number of people who live in a geographical area