Postcode API is a free service that allows anyone to easily lookup Australian suburbs and postcodes based on various criteria.
Version 0 is now available in public beta.
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$ curl http://v0.postcodeapi.com.au/suburbs/3066.json -H 'Accept: application/json; indent=4' [ { "name": "Collingwood", "postcode": 3066, "state": { "name": "Victoria", "abbreviation": "VIC" }, "locality": "HAWTHORN", "latitude": -37.8, "longitude": 144.9833 } ]