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# History

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### Demographic FAQs

### Also in this Section:

                          - What day was the census taken each decade?
                          - When was Puerto Rico first included in a census of the United States?
                          - When was the first census in the United States?
                          - When did the U.S. Census Bureau begin using statistical sampling?
                          - Why do the schedules used in the 1790-1820 censuses differ?
                          - When did the U.S. Census Bureau begin collecting housing data?
                          - Have census records always been confidential?

## When was Puerto Rico first included in a census of the United States?

Puerto Rico was first enumerated by the U.S. Census Bureau for the U.S. War Department in 1899. Puerto Rico has been included as part of the decennial census since 1910. The Census Bureau conducted the first economic census in Puerto Rico in 1909.  For more information about the censuses in Puerto Rico and other U.S. Territories, visit the Island Areas Web page.

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Measuring America's People, Places, and Economy

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