The postal square number is represented by the fifth digit of the postal code
Each postal section is divided into squares. The area of each square should not be more than 4x4 km². Squares were divided according on the following basis:
- Considering that no square should exceed 4x4 km².
- Squares within low-density urban zones should be about 2x2 km².
- Squares within high-density and populated urbban zones should be about 1x1 km².
- Squares divisions are based on the network of main and side roads and streets, according to the nearest to the branch axis. The smallest number is assigned to square that are nearest to the axis. Square numbers increase ascendingly as we move far from the axis.
Postal Square of section 8