Home Postcodes by state WA 6415 Postcode 6415 6415 is the postcode for 6 localities in WA: Goomarin, Korbel, Merredin, Nokaning, Norpa and Tandegin. Localities with postcode 6415GoomarinWAKorbelWAMerredinWANokaningWANorpaWATandeginWA Postcode 6415 State or territory Western Australia (WA) Localities 6 Council area Merredin Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6414 · Postcode 6418