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Sequential Serial Number, Household Record


SERIAL is a 6-digit numeric variable.


SERIAL is an IPUMS NHIS-constructed value that is an identifying number unique to each household in a given survey year. The combination of YEAR and SERIAL provides a unique identifier for every household in the IPUMS NHIS database.


This variable is fully comparable before 2019.

The NHIS questionnaire was substantially redesigned in 2019 to introduce a different data collection structure and new content. For more information on changes in terminology, universes, and data collection methods beginning in 2019, please see the user note.


  • 1963-2018: All households.
  • 2019-2022: Sample adults age 18+ and sample children age 0-17.


  • 1963-2022


  • No weights are available for this variable. Please refer to SERIAL for more information.