Home Postcodes by state WA 6443 Postcode 6443 6443 is the postcode for 11 localities in WA: Balladonia, Caiguna, Cocklebiddy, Dundas, Eucla, Fraser Range and 5 more. Localities with postcode 6443BalladoniaWACaigunaWACocklebiddyWADundasWAEuclaWAFraser RangeWAHigginsvilleWAMaduraWAMundrabillaWANorsemanWAWidgiemoolthaWA Postcode 6443 State or territory Western Australia (WA) Localities 11 Council area Dundas; Coolgardie Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6442 · Postcode 6445