Postal Code (CEP) Format in Brazil
The standard format is "nnnnn-nnn" (the original five digits, a hyphen, and the new three digits). The First 5 digit points the city or Municipality level. The last 3 digits of the code refer to the individual identification of localities, places, special codes and postal units, so called distribution identifiers.
From left to right, the numbers indicate the region, sub-region, sector, sub-sector, sub-sector divider and distribution identifiers (last three digits)