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The block relationship files are based on Census 2000 county boundaries.   If there has been a change or correction to a state or county boundary, the 1990 census blocks associated with the change will be listed in the block relationship file for the state/county that gained territory.  If a 1990 census block does not appear in the relationship file you expect to see it in, check all adjacent county files for that 1990 census block.   Below are links to listing of counties that had a state or county boundary change or correction between the 1990 census and Census 2000.  Changes are reported between counties using FIPS codes.

Changes at the state and county level between the 1990 tabulation blocks and the Census 2000 tabulation blocks:

State file
Lists 2-digit 1990 state FIPS code followed by the 2-digit 2000 State FIPS Code - xx,xx.
County file
Lists 1990 2-digit state FIPS code and 1990 3-digit county FIPS code followed by 2000 2-digit state FIPS code and 2000 3-digit county FIPS Code - xx,xxx,xx,xxx.

Changes at the state and county level between the 1990 tabulation blocks and the Census 2000 collection blocks:

State file
Lists 2-digit 1990 state FIPS code followed by the 2-digit 2000 State FIPS Code - xx,xx.
County file
Lists 1990 2-digit state FIPS code and 1990 3-digit county FIPS code followed by 2000 2-digit state FIPS code and 2000 3-digit county FIPS Code - xx,xxx,xx,xxx.

Changes at the state and county level between the Census 2000 collection blocks to Census 2000 tabulation blocks:
State file
Lists 2-digit 1990 state FIPS code followed by the 2-digit 2000 State FIPS Code - xx,xx.
County file
Lists 1990 2-digit state FIPS code and 1990 3-digit county FIPS code followed by 2000 2-digit state FIPS code and 2000 3-digit county FIPS Code - xx,xxx,xx,xxx.


Appendix A of the Census 2000 TIGER/Line^® Technical Documentation contains a listing of all State and County names and their associated FIPS (Federal Information Processing Standards) Codes.   Select either [PDF] or [Text] format.

[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.