Census Tract Measures

The following data items are available for the census tract in which the mothers, fathers and Primary Caregiver (year 15) lived at each interview:

Demographics of census tract population

  • percent of tract that is different racial ethnic groups (e.g., white, black, hispanic)
  • percent of tract that is foreign born
  • percent of females in tract that are of childbearing age (15-49)
  • percent of family HHs with kids < 18 headed by females
  • mean number of persons per HH

Education of census tract population

  • percent of 16-19 year olds in tract that are enrolled in school
  • percent of 25+ population in tract with H.S. or higher education
  • percent of 25+ population in tract with bachelor's degree or higher

Employment of census tract population

  • percent of civilian labor force (16+) that are employed
  • percent of civilian labor force (16+) that are unemployed

Housing conditions and rent

  • percent of housing units vacant
  • percent of housing units built before 1940
  • percent of occupied housing units renter occupied
  • percent of occupied housing units without phone service
  • percent of occupied housing units lacking complete plumbing
  • median gross rent as percent of HH income
  • median monthly gross rent
  • median housing value
  • median year housing structure built

Income and public assistance

  • percent of households on public assistance
  • percent of families below poverty level
  • percent of families with income... <$10,000; $10,000 to $14,999; $15,000 to $24,999; $25,000 to $34,000; $35,000 to $49,999; $50,000 to $74,999; $75,000 to $99,999; $100,000 to $149,999; $150,000 and higher.
  • median HH income
  • percent of persons with income X relative to poverty line ... less than .50; .50 to .74; .75 to .99; 1.00 to 1.24; 1.25 to 1.49; 1.50 to 1.74; 1.75 to 1.84 1.85 to 1.99; 2.00 and higher.

These variables are available for families in which we could determine their residence. A unique pseudo-tract identifier is available for respondents’ residence. It allows researchers to identify clustering of respondents within census tracts and the change of a respondent’s census tract residence across waves. The identifier does not allow researchers to identify respondents’ actual census tracts of residence. Additionally, some random noise has been introduced into the data to ensure that respondents' census tracts cannot be identified on the basis of the characteristics provided in this file. This noise should have no impact on analyses.

Please note that the pseudo-tract identifier is consistent from baseline to Year 9. However, because the boundaries of Census tracts changed between the 2000 and 2010 Census, the pseudo identifiers at Year 15 do not match those from the earlier waves.

Documentation for these data can be found here.

Note: Due to the sampling design of the study, there is only a small to moderate amount of respondent clustering within census tracts at any given wave. The following table shows the number of respondents whose residence was determined and the number of unique tracts.


Number of



of  unique

census tracts

  Baseline 4725 2631
  Year 1 4261 2616
  Year 3 4078 2631
  Year 5 4095 2780
  Year 9 3539 2563
  Baseline 4069 2474
  Year 1 3614 2426
  Year 3 3268 2337
  Year 5 2988 2245
  Year 9 2625 2080
Primary Caregiver    
Year 15 3,544 2,720

If you have additional questions about this data, you can email ffdata@princeton.edu