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Table 1 A Summary of Census ZCTA Characteristics

From: On the use of ZIP codes and ZIP code tabulation areas (ZCTAs) for the spatial analysis of epidemiological data


ZCTAs are linked to Census blocks and every tabulation block has a single ZCTA code


ZCTAs cover all tabulation blocks in the United States and Puerto Rico


ZCTAs may consist of two or more discontiguous areas


A ZCTA code represents a five digit ZIP code where possible


In large undeveloped areas where there are no master address file (MAF) addresses with five-digit ZIP codes, the ZCTA code assigned is based on the three-digit ZIP code (e.g. XX for tracts of undeveloped land and HH for water features)