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Person number in sample unit


PERNUM is a 2-digit numeric variable.


PERNUM numbers all persons within each household consecutively (starting with "1") in the order in which they are listed in the original CPS data. When combined with YEAR , MONTH, and SERIAL, PERNUM uniquely identifies each person within IPUMS-CPS samples, though not across IPUMS-CPS samples.


This variable is fully comparable across years.

Comparability with IPUMS-USA

This variable is comparable with the IPUMS-USA variable PERNUM.


  • 1962-1967 (ASEC only): Persons age 14+ (pre-1968 samples do not include persons under age 14).
  • 1968-2023 (ASEC only): All persons.
  • January 1976-December 1988 (non-ASEC): All persons.
  • January 1989+ (non-ASEC): All persons.


Years Jan Feb ASEC Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1962 – 1975 - - X - - - - - - - - - -
1976 – 2022 X X X X X X X X X X X X X
2023 X X X X X X X X X X X - -


This variable has no flags.

Unharmonized Variables

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