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The Census 2000 Block Relationship files are provided as a tool to help data users compare the universe of 1990 census blocks to the universe of Census 2000 blocks.  From these files, data users may determine how 1990 blocks now relate to Census 2000 blocks and vice versa.  Please use the links below to find out more information about the Census 2000 Block Relationship files and to download them.

Overview of the 2000 Census Block Relationship Files

2000 Census Block Relationship File Format

2000 Census Block Relationship File Record Layout

Download the Census 2000 Block Relationship Files

Block Part Flag Description

State and County Boundary Changes

Contact Information

[PDF] or denotes a file in Adobe’s Portable Document Format. To view the file, you will need the Adobe® Reader® available free from Adobe.