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Unique Family Identifier


FAMID is a 2-digit numeric value.


FAMID is an identifier that uniquely identifies families within a household according to the Census Bureau definition of family.

The Census Bureau defines a family as: a group of two people or more (one of whom is the householder) related by birth, marriage, or adoption and residing together; all such people (including related subfamily members) are considered as members of one family. Beginning with the 1980 Current Population Survey, unrelated subfamilies (referred to in the past as secondary families) are no longer included in the count of families, nor are the members of unrelated subfamilies included in the count of family members. The number of families is equal to the number of family households, however, the count of family members differs from the count of family household members because family household members include any non-relatives living in the household. For more information on Census bureau definitions of families, see their technical documentation.


This variable is comparable across years.


  • All families.


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


This variable has no flags.

Unharmonized Variables