Census Tract
The Census Tract is an area roughly equivalent to a neighborhood established by the Bureau of Census for analyzing populations. They generally encompass a population between 2,500 to 8,000 people. Bureau of Census describes them as "relatively permanent", but they do change over time. Therefore in order to compile data on a certain neighborhood over several decades it will be necessary to figure out the correct tract number(s) for a given neighborhood every census year.[1]
A census tract is smaller than a City but larger than a Block Group or Census Block. In Census Bureau data products, geographic entities usually are presented in a hierarchical arrangement or as an inventory listing.[2] The Bureau of Census also provides a helpful guide[3] to Geographical Terms and Concepts.
According to the "72-Year Rule," the National Archives releases census records to the general public 72 years after Census Day. As a result, the 1930 census records were released April 1, 2002, and the 1940 records were released April 2, 2012. The 1950 census records will be released in April 2022.[4]
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