About Australia Postcodes: In Australia, postcodes play a pivotal role in the efficient functioning of the postal system and are integral to location identification. Introduced in 1967, the Australian postcode system consists of four-digit numerical codes assigned to specific geographic areas. For addressing Australian Postcodes are written after the name of the city, suburb, or town, and the state or territory. Postcodes help streamline mail sorting and delivery. Postcodes are often used in various sectors beyond mail delivery, such as demographic analysis, regional planning, and market research. There are currently about 2600 postcodes covering all of Australia.