The alert eyes (and computer processing skills) of one of the many state Department of Transportation folks processing the UA Census 2000 TIGER/Line files has discovered that the 1990 Urban/Rural code on Record Type S in the UA Census 2000 TIGER/Line files is in error. We have determined that this affects over 1000 counties, and are now preparing a notice for our web site. We also are discussing how to best resolve this situation. The error overstates the extent of the 1990 urban classification in the affected counties -- some polygons are classified as 1990 urban when they should have been 1990 rural. The 2000 UA/UC codes and Urban/Rural codes are correct, as is the 1990 UA code.

Until we determine a solution, the correct 1990 Urban/Rural code is located on the Census 2000 TIGER/Line files on Record Type A. For both versions (the Census 2000 and the UA Census 2000 TIGER/Line files), the CENID/POLYID codes are the same, so you can use the CENID/POLYID as a match key across these two versions.