Australia Postcode Lookup
Australia's postcodes look simple, four digits, 2,912 of them, but the suburb behind each one is where the confusion starts. Ask ten people for their area's postcode and you will hear three different answers, because postcodes follow postal delivery rounds, not suburb boundary lines. This free lookup works both ways: type a suburb name to find its postcode, or enter four digits to see every suburb and locality sharing it. It covers roughly 16,500 suburbs, towns and localities across every state and territory, drawn from a regularly updated public dataset. Use it when a form demands a postcode you cannot remember, when a parcel label shows a code you do not recognise, or when a courier insists your address sits in a different delivery zone. No signup, no address lists, no waiting, just type and read. Search by suburb name or postcode number across all states and territories, using Australia Post delivery area data.
Last updated: October 22, 2026
Your result
Searches 2,912 Australian postcodes across about 16,500 suburbs and localities. Results come from a regularly updated public dataset, always confirm critical mail with Australia Post.
The formula
Search mode one, suburb to postcode: type the locality name and the tool matches it against the suburb dataset to return its postcode.Search mode two, postcode to suburb: enter four digits and it lists every suburb and locality recorded under that postcode.Partial matches rank first, so a few letters are enough, no exact spelling required.
A worked example
Enter 2000 and the tool returns Sydney, New South Wales, the Sydney GPO and central business district postcode. Search the other way with "Ballarat" and you get 3350, Victoria. Regional codes work the same way: try 0800 and you land on Darwin in the Northern Territory. If your search returns several matches, more than one suburb can share a name, pick the one in the right state and copy its postcode.
More about the Australian Postcode Lookup
How the two way postcode search works
Most postcode finders only go one direction; this one goes both ways, which matters more than it sounds. Type a suburb, "Fremantle", "Parramatta", "Cairns", "Hobart", and the tool matches your text against a dataset of roughly 16,500 Australian localities, returning the postcode plus the state. Spelling need not be perfect: partial matches rank first, so typing "wollon" still surfaces Wollongong, and you never need the exact official locality name. When several suburbs share a name across states. Australia has multiple Richmonds, Springfields and Fairfields, each result shows its state and neighbouring localities so you pick the right one before copying anything into a form. Rural users get the same treatment: small towns, farming localities and outback stations with their own delivery codes are all in the dataset, not just the capital cities. If a search comes back empty, try fewer letters, and remember that very new estates can trade under a developer's marketing name long before the locality is officially gazetted.
Flip it around and four digits answer the reverse question: what area does this postcode actually cover? Enter a postcode and you see every suburb and locality listed under it, the fastest way to make sense of an unfamiliar code on a courier's depot sticker, a second hand marketplace listing or a form that auto filled something suspicious. Expect surprises. A single postcode routinely spans several suburbs: 2000 stretches beyond the Sydney CBD into neighbouring localities, and 3000 covers more of Melbourne than tourists expect, because Australia Post groups nearby streets into one delivery round regardless of suburb boundaries. The reverse happens too, large suburbs are split across several postcodes when mail volume demands it. Then there are the special purpose codes: PO box postcodes that differ from the street postcode of the same suburb, GPO codes like 2001 in Sydney, and large volume receiver codes assigned to big organisations. Knowing which flavour a recipient needs, street or PO box, is the difference between a parcel arriving and a parcel touring the state.
What this lookup can and cannot tell you
This is an independent postcode checker built on a regularly updated public dataset. It is not Australia Post's own live system, and it does not verify street addresses or individual delivery points. For everyday questions that distinction rarely matters: filling in online forms, answering "what is my postcode" after a move, labelling a parcel, settling an argument about which postcode a suburb belongs to, or checking a delivery surcharge zone before ordering. The dataset is refreshed regularly, so ordinary changes, new suburbs, renumbered rural codes, boundary adjustments, flow through without you doing anything. But brand new developments can lag: a just built estate may trade under a marketing name months before its locality is officially gazetted and assigned a code. For genuinely critical mail, legal documents, tax forms, government applications, confirm the code against Australia Post's official finder before you send. Think of this tool as the quick everyday answer and Australia Post as the final authority.
A few honest limits keep you out of trouble. Postcodes describe postal delivery areas, not neat suburb boundaries, so a suburb's postcode is really shorthand for "the postcode Australia Post uses for mail addressed to that suburb", and edge streets sometimes fall under the neighbouring code. If your street sits exactly on a boundary, a recent piece of addressed mail is the tiebreaker: the code printed on a bill that reached you is the code that works. This tool also cannot confirm whether a specific house number exists; it answers locality level questions only, so it will not validate a full street address. Used within those bounds, it is the quickest free way to resolve any Australian postcode question: 3000 is Melbourne's CBD, 2000 is Sydney's, 0800 is Darwin, and the other 2,909 codes are one search away. Bookmark it if you move often, run a small business that ships parcels, or fill in enough online forms to have memorised three postcodes you will never use again. Regional postcodes sometimes cover enormous distances, a single outback code can stretch across hundreds of kilometres of highway, and the local roadhouse may be the only landmark sharing it.
A worked check before you post an important parcel
Suppose you are posting a contract to a street address in Parramatta and the postcode on your note says 2150. Type Parramatta into the suburb search and the result should confirm 2150 in New South Wales before anything goes in the mail. Then run the reverse check: enter 2150 and skim the suburb list. If Parramatta appears alongside neighbouring localities sharing the code, that is normal grouping, not an error in your address.
The mistake this two minute routine catches is the borrowed postcode: people copy the code of the suburb next door, the code of a well known city centre address, or the PO Box code of the same suburb, which can differ from its street code. Each flavour routes mail differently. If the recipient gave you a box number, use the box postcode they supplied; if it is a house or office, confirm the street suburb here and use its code instead.
Reading the first digit as a hint, not a promise
The first digit of an Australian postcode gives a broad regional hint: codes starting with 2 sit mostly in New South Wales, 3 in Victoria, 4 in Queensland, 5 in South Australia, 6 in Western Australia and 7 in Tasmania, while Northern Territory codes start with 0. Used loosely, that hint is a fast sanity check, a supposed Melbourne address wearing a postcode that starts with 6 deserves a second look before you trust the form.
Treat it as a hint only, because the map has folds. The Australian Capital Territory uses codes in the 2600s and 2900s, which sit numerically inside the New South Wales range, and some large organisations hold special codes that ignore geography altogether. Border towns can also surprise you, since delivery rounds follow roads rather than state lines. When the first digit and the stated state disagree, trust the suburb lookup result over the rule of thumb and check the full address again.
How to use the Australian Postcode Lookup
- Type a suburb name, or enter a four digit postcode, in the search box.
- Pick the matching suburb from the list if several appear.
- Read the postcode, state and locality details in the result.
- Copy the postcode into your form, label or address book.
Frequently asked questions
How do I find a postcode by suburb?
Type the suburb name into the search box, near enough is good enough for spelling, and the au postcode finder matches it against the locality dataset. Where several suburbs share a name, each result shows its state and neighbouring localities so you can pick the right one. It is the fastest way to find a postcode in Australia without an address list.
Why does one postcode cover several suburbs?
Because postcodes map to postal delivery areas, not suburb boundaries. A single code like 2000 serves Sydney's CBD plus the surrounding localities, since Australia Post bundles nearby areas into one delivery round. It also works in reverse: large suburbs get split across several postcodes when mail volume demands it. Use the postcode to suburb direction of this australian postcode checker to see exactly which localities any code covers.
Can I search by postcode to find the suburb?
Yes, it works both ways. Enter any four digits, from 3000 for Melbourne's CBD to 3999 and every code between, and the tool lists each suburb and locality recorded under that postcode. Handy as an australia postal code lookup for couriers, form fillers and anyone squinting at an unfamiliar code on a parcel.
Does Australia use zip codes?
No, Australia calls them postcodes. They are four digits (a US ZIP code is five) and they follow postal delivery rounds rather than suburb boundary lines. In the lookup above, just type the suburb name or enter the four digits; no ZIP style formatting needed.
Is my PO Box postcode different from my street postcode?
Often yes. PO Box, locked bag and large volume receiver postcodes differ from the street postcode of the same suburb. Sydney's GPO boxes use 2001 while the CBD streets use 2000, for example. Use the street postcode for a physical address and the box postcode only for mail addressed to that box, or your parcel may take a detour through the system.
What does it mean when one suburb shows two different postcodes?
It usually means the suburb is large enough to be split between two delivery areas, or that its street addresses and its PO Boxes carry different codes. Large suburbs on city fringes are split most often. Use the code attached to the specific address type you are mailing: the street code for a house or office, and the separate box code when the address contains a box number.
What should I try if my suburb returns no result?
Shorten what you typed. The search matches partial names, so entering the first several letters of the suburb often surfaces it when a full or slightly misspelt name does not. Check for doubled letters and silent letters, try the name of the larger town the suburb belongs to, and remember that brand new estates may still be listed under the older locality name they were carved from.
Why does a form reject my postcode that starts with zero?
Because a spreadsheet or form field probably treated your postcode as a number and stripped the leading zero, turning 0800 into 800. Postcodes in the Northern Territory and parts of regional Australia begin with 0, and that zero is a real digit, not decoration. Re enter the code as text, include the zero, and if the form still refuses it, contact the sender, the fault is in their field, not your address.
Is the postcode alone enough to address mail correctly?
No. A postcode narrows mail to a delivery area, but the sorting system and the postie still need the recipient name, the street number and street name, and the suburb written clearly. Think of the postcode as the last check rather than the address itself: write the full address first, then use this lookup to confirm that the four digits at the end match the suburb you have written.