Census records are among the most useful source of data for family historians. Census records can provide genealogical missing link to tie together a group of family members in a way not possible with any other single data source.
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One can find census records for 1920 from the official government archives and records website. This website breaks the United States down to each state to enable one to view the records more easily.
In the US, census records for 1940 and later are subject to privacy laws and are not generally available until they become 72 years old. Earlier Census records are on microfilm and available through local libraries, through the Family History Centers operated by the Mormon Church, and through the US National Archives and its regional branches. The Census records of other countries are available under different circumstances, often only after they are 100 years old.
There are many types of records that keep track of things. For example, weather records started being recorded in 1914 and the Census Bureau began keeping records in 1940.
The census records for the entire 1890 US Census were exposed to extreme water damage in 1921, when a fire occurred in the Department of Commerce building. Little effort was made to remediate the damage and the papers deteriorated while the Bureau of the Census and the Library of Congress debated what to do about them. Historians and preservationists were not consulted. In 1933, Congress approved a list of documents to be destroyed, which, perhaps mistakenly, included the damaged 1890 Census records. The documents were probably destroyed some time in 1934 or 1935.The data on individual households for the 1800 and 1810 US Censuses is also no longer extant.