Home Postcodes by state WA 6309 Postcode 6309 6309 is the postcode for 4 localities in WA: East Popanyinning, Popanyinning, Stratherne and West Popanyinning. Localities with postcode 6309East PopanyinningWAPopanyinningWAStratherneWAWest PopanyinningWA Postcode 6309 State or territory Western Australia (WA) Localities 4 Council area Cuballing Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6308 · Postcode 6311