Home Postcodes by state WA 6506 Postcode 6506 6506 is the postcode for Mogumber, WA. Localities with postcode 6506MogumberWA Postcode 6506 State or territory Western Australia (WA) Localities 1 Council area Victoria Plains Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6505 · Postcode 6507