Census 1970


   Overview of Products
  • Summary Files
  • Microdata
  • Maps-Spatial Data
     Data Sources
  • Online Extraction
  • GIS/Spatial Data Products
  • DVD/CDs
  • File for FTP
     General Information
  • Complete CU Library Holdings
  • Congressional District Data
  • Historical Census Data
  • Comparing 1980 with other years
  • Reference Material

Overview of Products

The lowest level of geography for summary data from 1970 is either block groups (in areas were tracts were defined) or elsewhere enumeration districts (ED). This overview outlines how key products were originally published and highlights only a few of the custom products that were subsequently produced based on the original.

Note that some sample questions were asked of either a 15% or a 5% sample of households, but some were asked for both, thus constituting a 20% sample. Variation can occur among totals based responses from 20%, 15% or 5% samples.

  • Summary Files
    The table below outlines the most commonly used summary files from the 1970. Not all these files are readily available. For some that are all states may not be reported.

Short form, 100% count- exact counts

1st Count
  A: States-Block Group-EDs
  B: States, counties, places & Cong.Dist.

2nd Count
  A: States and Tracts
  B: States, counties, MSAs and places

Long form, Sample count- estimates

4th Count
  A: States-Tracts
  B: States-MCDs-CCDs
  C: States-MSA-Urban areas

5th Count
   A: 3 digit Zip Code
   B: 5 digit Zip Codes by SMSA
   C: States-Tracts-Block Group/EDs

  • Other Summary File Products
    Special subsets based on either geography or topic have been created from the Summary Files. When needs can be met with these files, they are easier to use than the original files. Also there are the Elizabeth Bogue Census Tract Files for which data was keyed in from the printed tract reports for selected metropolitan areas.
  • Public Use Microdata
    Public Use Microdata were produced and reported for county groups, states, and geographic divisions with neighborhood characteristics each with a population of at least 250,000. Originally the files were hierarchical (contain both household and person records). A modified version is also available that combines household and person data on record so that the file is rectangular.
  • Maps
    Columbia's holdings for 1970 maps are described on the Government Documents 1970 Decennial Census Information web page.

Data Sources

  • Files for FTP
    If using the ascii versions of the summary files, users should acquaint themselves with how certain Technical Issues are handled. Suppression and allocation are issues of particular interest to those dealing with tract level or smaller geographies.
    • ICPSR
      Provides the most complete archive of 1970 files including a number of special extractions produced by the Census Bureau for easier access for some geographic areas and the Elizabeth Bogue tract data files for selected metropolitan areas (does not include NYC).
    • CU Data Catalog
      Selected files (especially for New York City counties) are available. Search the data catalog for study number 1970 to see what is available.
  • Online Extraction Data
    • Social Explorer
      Use Data & Tools then choose Browse Reports to obtain selected tables for years including 1970.
    • National Historical Geographic Information System (NHGIS)
      NHGIS provides an online extraction tool for selected summary file variables at the national, state, county, and tract/block numbering areas allowing for multiple locations at one level of geography to be downloaded at once
    • Longitudinal Tract Data Base (LTDB)
      Preselected 1970 population characteristics in Excel spreadsheets reported for tracts as defined in 1970 or as defined in 2010. LTDB also has a feature that allows you to adjust any data based on 1970 tracts to estimates based on 2010 tracts.
    • Integrated Public Use Microdata Series (IPUMS)
      At this site custom extractions of public use microdata can be done. Coverage is for all census years since 1850 except 1930.
  • Spatial Data

General Information