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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

1. ZCTAs are linked to Census blocks and every tabulation block has a single ZCTA code
2. ZCTAs cover all tabulation blocks in the United States and Puerto Rico
3. ZCTAs may consist of two or more discontiguous areas
4. A ZCTA code represents a five digit ZIP code where possible
5. 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)