Table 2

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


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

Grubesic and Matisziw International Journal of Health Geographics 2006 5:58   doi:10.1186/1476-072X-5-58