Home Postcodes by state WA 6432 Postcode 6432 6432 is the postcode for 4 localities in WA: Boulder, Fimiston, South Boulder and Victory Heights. Localities with postcode 6432BoulderWAFimistonWASouth BoulderWAVictory HeightsWA Postcode 6432 State or territory Western Australia (WA) Localities 4 Council area Kalgoorlie-Boulder Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6431 · Postcode 6434