
Postcodes in Australia were introduced in 1967 to make sorting and routing mail more efficient. They consist of four digits and are placed at the end of the address, before the country name. The first one or two digits indicate the state or territory, with some postcodes covering multiple states. Australian postcodes are often linked to a specific area, but some cover large populations, and a few remote areas have no postcodes at all. To find a postcode, you can use a postcode finder or search within a specified radius.
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What You'll Learn

Use the Australia Post postcode finder
To find an Australian postcode, you can use the Australia Post postcode finder. This is a quick and easy way to search and check postcodes for suburbs and locations across Australia.
The Australia Post website offers a range of tools to help you find the correct postcode. Firstly, you can download postcode data for non-commercial and commercial use. This will provide you with a comprehensive list of all Australian postcodes, which you can then use to search for a specific suburb or location.
Alternatively, you can use the postcode search function on the Australia Post website. Here, you can enter a specific postcode or area name and click "find" to discover the relevant postcode. This tool also allows you to browse cities, towns, and suburbs by state, which can be helpful if you are unsure of the exact location.
The Australia Post postcode finder is designed to ensure that your mail and deliveries are addressed correctly and reach their intended destination without delay. Australian postcodes consist of four digits and are placed at the end of the address, before the country name. For example, the postcode for Blacktown, NSW is 2148.
It is important to note that some places in Australia do not have postcodes, typically remote areas with little or no population. Additionally, some towns and suburbs may have two postcodes, one for street deliveries and another for post office boxes.
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Understand the numbering system
Postcodes in Australia follow a 4-digit numeric system, introduced in 1967 with the country's first mechanised mail processing centre. The system was brought in by the Postmaster-General's Department (PMG) to replace earlier postal sorting methods, such as Melbourne's letter and number codes (e.g. N3, E5).
The first digit of each postcode was originally taken from the numerical prefixes of Australian radio call signs, which were based on state/territory borders. For example, 2xx in New South Wales, 3xx in Victoria, and so on. However, over time, the initial digits of postcodes have deviated from this system. For instance, the 8000 series now refers to special addresses in Victoria.
Postcodes are assigned to specific geographic areas, and they often correspond to a single location. For example, 6160 belongs only to Fremantle, Western Australia. However, some postcodes cover multiple localities, such as postcode 2620, which includes Gundaroo, NSW, and Hume, ACT.
The range of postcodes in Australia is from 0200 for the Australian National University (now 2601) to 9944 for Cannonvale, Queensland. Some towns and suburbs have two postcodes—one for street deliveries and another for post office boxes.
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Find postcodes within a radius
To find Australian postcodes within a radius, there are several methods you can use. One option is to utilise online tools such as Free Map Tools, where you can specify a point and a radius to search within, and it will return all the postcodes found inside that radius. Alternatively, you can use a database of Australian postcodes with latitude and longitude coordinates, such as the one provided by Australia Post, to calculate the distance between the centroid of a starting postcode and the centroid of other postcodes within the desired radius. This method may require the use of a macro or programming to automate the process.
It's important to note that postcodes in Australia follow a four-digit format, with the first two digits indicating the state or region. For example, New South Wales has postcode combinations between 1000 and 1999, 2000-2599, and 2619-2898, while Victoria's postcodes range from 3000 to 3999 and 8000 to 8999. By knowing the postcode structure, you can more easily identify the desired location.
When searching for postcodes within a radius, you can also consider drawing your search area on a map. Tools like Embr allow you to drop a pin on a map and then search for postcodes within a specified kilometre radius of that pin. This can be useful if you're targeting a specific area rather than a complete radius.
Additionally, if you're looking for postcodes for towns and suburbs in Australia, Australia Post provides a postcode finder on their website. This can be a quick and easy way to search for postcodes without having to rely on radius searches. However, if you intend to use their postcode data for commercial or business purposes, you will need to obtain a licence.
By utilising these methods, you can effectively find Australian postcodes within a specified radius, whether it's for personal or business needs.
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Use a postal code lookup tool
To find an Australian postcode, one can use a postal code lookup tool. Australia Post offers a postcode finder that allows users to search and find postcodes for all towns and suburbs across Australia. This ensures that mail and deliveries reach their destinations without delay.
Some websites offer a postal code lookup tool for Australia that provides the postcode for a specific location. For example, Adelaide has the postal code of 5000, while Canberra has postal codes ranging from 2600 to 2609. These tools can also provide the range of postal codes for different states and territories. For instance, New South Wales has postal codes ranging from 1000 to 1999, 2000-2599, and 2619-2898.
Other websites offer a more advanced search functionality that allows users to specify a point and a radius to search within and find all the postcodes within that radius. This can be particularly useful for targeted mailings. For example, if one wants to find all the postcodes within a 100km radius of Brisbane, they can input the postcode for Brisbane (4000) and the desired radius to get a list of postcodes within that area.
These postal code lookup tools are valuable for individuals and businesses who need to send mail or parcels to specific locations in Australia. By using these tools, one can ensure that they have the correct and most up-to-date postal code information, facilitating accurate and timely deliveries.
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Find a postcode on a map
Postcodes in Australia were introduced in 1967 to efficiently sort and route mail in the Australian postal system. They consist of four digits and are placed at the end of the address before the country name. The first one or two digits usually indicate the state or territory. For example, New South Wales has postcodes between 1000 and 1999, 2000-2599 and 2619-2898, while Victoria has postcodes in the 3000-3999 and 8000-8999 range.
To find a postcode on a map, you can use online tools that allow you to specify a point and a radius to search within and return all the postcodes found inside that radius. For example, if you want to find postcodes within a 100km radius of Brisbane (postcode 4000), you can use online tools to do so.
Additionally, you can refer to Australia Post's postcode finder, which is a quick and easy way to search and find postcodes for all towns and suburbs in Australia. Postcodes are also published in booklets available from post offices or online from the Australia Post website.
It is worth noting that some places in Australia, typically remote areas with little or no population, do not have postcodes.
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Frequently asked questions
You can find an Australian postcode by using the Australia Post postcode finder, which allows you to search and find postcodes for all towns and suburbs in Australia.
You can specify a point and a radius to search within and the tool will return all the postcodes found inside that radius.
Australian postcodes consist of four digits and are written after the name of the city, suburb, or town, and the state or territory. For example, "Recipient Name, 100 Citizen Road, BLACKTOWN NSW 2148".


































