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- Recommended Citation(s)*:
Center for International Earth Science Information Network - CIESIN. 1996. Archive of Census Related Products (ACRP): 1990 ZIP Equivalency Files. Palisades, NY: NASA Socioeconomic Data and Applications Center (SEDAC). https://doi.org/10.7927/H4TD9V7F. Accessed DAY MONTH YEAR.
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Census Block Level
The zip equivalency files contain a subset of population counts/housing units data derived from the STF3B header file including 5-digit zipcodes for each census block. These data files contain a POLID census block field that corresponds to the POLID of the Tiger-based boundary files at the census block level. The Tiger data can be found at /pub/census/usa/tiger/xx/bnablk (where xx represents the state postal codes).
directory path: /pub/census/usa/zipeq
The Geocorr search engine is an alternate way of accessing the data in the STF3B header file.
Census Blockgroup Level
These zip equivalency files contain data that has been aggregated from the census block level to the census blockgroup level and incude population centroids. The "POP" and "HUS" counts are summed for all census blocks belonging to the same blockgroup. These totals will be slightly different from the STF3A reported PERSONS count because of sample count weighting. Total metro, urban, and urbanized area populations are included based on the census block level. Population centroids for the blockgroups have been calculated, by "weighting" the census block spatial centroids with the population counts.
directory path: /pub/census/usa/zipeq/b2bg
Comma Separated Value (.csv)
SAS Transport (.xpt)
Source code used to read the zip equivalency files:
- b2bg.sas - SAS program which reads the block files and collapses those units into blockgroup data while calculating centroids.
- readzip.sas - SAS program used to convert .csv files in the archive to SAS datasets
- zipcnty.sas - table lookup tool (format tool) used to assign counties
- zipeq90.hlp - notes about the data files
- zipeq90.lbl - listing of the variable labels for the datafiles
- zipmetro.sas - listing of the values for the metropolitan variable
- zipname.sas - listing of the values for the zipname variable
- zipread.me - information file