• Geographic Relationships Over Time (Comparability)
  •     Block Relationship Files
  •     Tract Relationship Files
    
• Geographic Relationships Between Entity Types
  
  •     Congressional District Relationship Files

These files show the relationships (comparability) for the same type of geography over different periods of time (e.g. the relationship between places in 2010 and places in 2000).

The Census 2000 block relationship files are available to the public for download by individual county from the Census Bureau’s Web site. The relationship files are organized by type of relationship file, i.e. 1990 Tabulation Census Block to Census 2000 Tabulation Block.

1990 Tabulation Census Block to Census 2000 Tabulation Block File

1990 Tabulation Census Block to Census 2000 Collection Block File

Census 2000 Collection Block to Census 2000 Tabulation Block File

As part of the Census 2000 geographic product series, the Census Bureau has produced Census Tract Relationship Files. (In previous censuses, this product was called a comparability file.) These files show how Census 1990 census tracts relate to Census 2000 census tracts.

These files show the relationship between different types of geography for the same time period (e.g. the relationships between congressional districts and places).

Congressional Districts by American Indian Areas

Congressional Districts by Census Tract

Counties by Congressional District

Congressional Districts by Counties

Congressional Districts by County Subdivisions

Congressional Districts by Places

Congressional Districts by School Districts

Congressional Districts by Urban/Rural Population and Land Area

Congressional Districts by Zip Code Tabulation Areas (ZCTAs)