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Statistically Adjusted PL94 Data


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Nationwide dataset of block-level data extracted from the statistically adjusted 2000 census PL94-171  file released by the Census Bureau under court order in December 2002.

Census Bureau Disclaimer

Accuracy and Coverage Evaluation Revision II  (April 4, 2003)

Download state-by-state adjusted block data from FairData:

 Statistically Adjusted PL94 Data

Download nationwide adjusted block-group data from FairData:

Statistically Adjusted PL94 Data Nationwide Block Groups

Interactive "Zoomable/Clickable" Thematic Map  (works with browser)

NOT COMPATIBLE WITH FIREFOX 1.5 (click for details)

   Undercount Mapper 

(displays nationwide undercount data from the 2000 census -- block group, tract, and county levels)

See Also: Hard-to-Count 2010 Mapper (new 2009)

           High Detail "zoomable" Adobe Map  (zoom to 600+)

The complete adjusted dataset and associated boundary files for all geographic layers (in Maptitude binary format) can be purchased from Caliper.

UCLA site for raw data

Associated Press, December 07, 2002 "Census State List" Table (excludes Puerto Rico)


 Population field names generally follow Maptitude nomenclature.

The files are in a comma-delimited format. Field names are in the first row. The field labeled "Code" can be joined to a similar field created when building block-level TIGER files using Maptitude or other geographic information system software packages. PL94 -171 fields showing detail for 3+ races are excluded. A separate (and with the adjusted dataset, hypothetical) calculation based on the Office of Management and Budget/DOJ minority definition for election plans and civil rights enforcement  is included (field names containing "DOJ")  :

The Department of Justice allocates any multiple-race census response that included white and one of the five other race categories to the minority race listed in the response. The DOJ minority population figures include persons who identified themselves as (1) a single-race minority, (2) white plus one other race, (3) multiple-race (where more than one minority race is listed), or (4) Hispanic. This definition is in accordance with Department of Justice policy pursuant to Part II of OMB Bulletin 00-02. (Source: [Federal Register: January 18, 2001 (Volume 66, Number 12)] [Notices] [Page 5411-5414] From the Federal Register Online via GPO Access [wais.access.gpo.gov] [DOCID:fr18ja01-171]


A few geography fields were deleted, but the remaining geography field names were left unchanged. Many of the more obscure geography fields are either left blank or filed with 9's by the Census Bureau.
So while this is not the complete adjusted PL94 block-level dataset, it should be enough for most purposes. Population totals for higher levels of geography can be calculated using GIS or database software from these block-level files.
These files are provided on an "as is" basis. There is no guarantee that the data files are error-free. The files were produced using the same query and extraction module in  MS Access2002  used to produce FairData's unadjusted  PL94-171  dataset.  Since March 2001, FairData's  unadjusted PL94-171 files have been used in at least 35 states with no reported errors.



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