Skip Main Navigation Skip To Navigation Content

American Community Survey

Census.govAmerican Community Survey › Data & Documentation: Public Use Microdata Sample (PUMS)About PUMS › Pretabulated Data vs. Microdata
Skip top of page navigation

Pretabulated Data vs. Microdata

The ACS pretabulated (or summary) data are predefined tabulations of characteristics created by the Census Bureau in response to data user needs. The basic unit of analysis is a specific geographic entity -- state, county, etc. -- for which estimates of persons, families, households, or housing units in particular categories are provided.

With microdata, conversely, it is the user who determines the structure of the tabulation and the characteristic(s) to be tabulated.

In the ACS microdata, the basic unit is an individual housing unit, persons who live in the selected housing unit, or a group quarters person. Each record shows most of the information associated with a specific housing unit or individual except for personal identifying information and some things that could be used to identify an individual. The most detailed geographic area available in PUMS are Public Use Microdata Areas (PUMAs), or areas containing about 100,000 residents.

Get Data Profile Tables on American FactFinderCurrent Data Profiles

Your Help Needed

Participate in a brief online usability test to improve this website

Call UsCall Us

  • General 1-800-923-8282
  • Questionnaire 1-800-354-7271
  • ¿Ayuda? 1-877-833-5625
Source: U.S. Census Bureau | American Community Survey Office | Email ACS | Last Revised: April 13, 2015
Give us your feedback on this website!