Trinidad and Tobago, which has 72 postal districts, will have a six-digit postal code.

The first two digits will point to the postal district, and will identify the main TTPost delivery office, which will process the mail.

The second two digits will represent the area within the postal district called the delivery loop. The last two digits represent the zone or building within the delivery loop — the geographic location of a group of addresses.

Professor Jacob Opadeyi, the mastermind behind the development of the postal code system said the Universal Postal Union (UPU), of which Trinidad and Tobago is a signatory, stated it was necessary to develop a postal code in the Caribbean region as many towns in countries in the region have similar names, "which result in problems with inbound and outbound mail."

Opadeyi explained the new postal code can result in improvements in the efficiency and accuracy of local addresses, a reduction in undelivered mail and improved billing and customer services.

Source: http://www.newsday.co.tt/news/0,140412.html