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Census Data Resources: Comparing Over Time

Guide to (mostly online) resources for manipulating and extracting Census data.

Comparing Decennial Long Form Data to ACS Data

Reference Materials for Historical Census Research

Resources for Comparing Censuses

Some words of caution for making comparisons across censuses:

  • Boundaries for all Census administrative geographies (tract-level and below) change across censuses.
  • Some of the questions asked on the census questionnaire have changed over time, as have the ways respondents were instructed to answer.
  • Time series analysis below the tract level is inadvisable.