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Table 2 Numerical Differences between ZCTA and ZIP Code Geographic Base Files in New York State

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

  ZCTA (2000) ZIP Code (GDT 2000)
Number of Polygons 2,450 1,599
Number of Unique Records 1,676 1,599
Average Size 51.90 km2 70.26 km2
Minimum Size 0.003 km2 0.006 km2
Maximum Size 1,054 km2 1,217 km2
Standard Deviation in Size 80.34 km2 102.71 km2