Home Postcodes by state WA 6258 Postcode 6258 6258 is the postcode for 22 localities in WA: Balbarrup, Crowea, Deanmill, Diamond Tree, Dingup, Dixvale and 16 more. Localities with postcode 6258BalbarrupWACroweaWADeanmillWADiamond TreeWADingupWADixvaleWADonnelly RiverWAGlenoranWAJardeeWALake MuirWALinfarneWAManjimupWAMiddlesexWAMordalupWAPalgarupWAPerupWAQuinninupWARingbarkWASmith BrookWAUpper WarrenWAWilgarrupWAYanmahWA Postcode 6258 State or territory Western Australia (WA) Localities 22 Council area Manjimup; Nannup Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6256 · Postcode 6260