Records being released by the U.S. National Archives online after 72 years of confidentiality expires, according to the Washington Post.
According to the Post, more than 21 million people who are alive in the U.S. and Puerto Rico were recorded in the 16th federal decennial census.
Census records include names, addresses and, in the case of the 1940 census, income and employment information, the Post said.
Access to the records will be available to anyone on the Internet, and free of charge. The Post said while a name index may not be immediately available to search, thousands of researchers across the country are expected to go through the digitized records for details on 132 million people this week.
Since 1942, the National Archives has made available records from past censuses every decade, according to the Post. However, some privacy advocates have opposed releasing such large amounts of personal data about living people.