North American Overlay Mapping

Layer Notes - Zip Codes

The foreground overlay 'Zip Codes' shows the boundaries which represent the Three-Digit ZIP Code Areas for United States along with the three-digit numbers that represent each area.

A U.S. Three-Digit ZIP Code Area represents the first three digits of a ZIP Code. The first digit of a five-digit ZIP Code divides the country into 10 large groups of states numbered from 0 in the Northeast to 9 in the far West. Within these areas, each state is divided into an average of 10 smaller geographical areas, identified by the 2nd and 3rd digits. These digits, in conjunction with the first digit, represent a sectional center facility or a mail processing facility area. These areas are serviced by the U.S. Post Office Sectional Center Facility (SCF). This data was sourced from the Census 2000 website.

Zip or Postal Code borders are not currently available for Canada or Mexico. If you know a source for this information, please Contact Me.