Home Postcodes by state WA 6029 Postcode 6029 6029 is the postcode for Trigg, WA. Localities with postcode 6029TriggWA Postcode 6029 State or territory Western Australia (WA) Localities 1 Council area Stirling Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6028 · Postcode 6030