Is there an equivalency or comparability data product that shows the relationship between Census 2000 ZCTAs™ (ZIP Code Tabulation Areas) and USPS 2000 ZIP Codes?
The Census Bureau is not planning to produce a 2000 ZIP Code to 2000 ZCTA relationship file. We created the ZCTAs specifically to address the inadequacies of ZIP Codes for census data tabulation. For those who may want to do this, the TIGER/Line® files will continue to show address ranges with mailing ZIP Codes. These files can be processed using a GIS to compare the ZCTA code for a block to the mailing ZIP Code associated with the address ranges on each block side. Such a comparison can provide a general idea of how the two relate. The relationship between ZIP Code and ZCTA can be determined fully only by comparing individual block-geocoded addresses to the ZCTAs. This process is quite involved. Some examples of why the process can become quite involved are as follows: ZCTAs follow census block boundaries. In contrast, USPS ZIP Codes serve addresses with no correlation to census block boundaries; therefore, the area covered by a ZCTA may include mailing addresses associated with ZIP C
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