Horizontal_Positional_Accuracy_Report:

• The information present in these files is provided for the purposes of statistical analysis and census operations only. Coordinates in the TIGER/Line files have six implied decimal places, but the positional accuracy of these coordinates is not as great as the six decimal places suggest.
  
  The positional accuracy varies with the source materials used, but generally the information is no better than the established national map Accuracy standards for 1:100,000-scale maps from the U.S. Geological Survey (USGS); thus it is NOT suitable for high-precision measurement applications such as engineering problems, property transfers, or other uses that might require highly accurate measurements of the earth's surface.
  
  The USGS 1:100,000-scale maps met national map accuracy standards and use coordinates defined by the North American Datum, 1983. More ...
  
  
• Metadata (comes with TIGER downloads and is FGDC standard)
  • says projections = CGS (Long. & Latitude) NAD 1983.

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