Home Postcode finder WA Greenmount Greenmount postcode WA Greenmount is a locality in Western Australia covered by postcode 6056. Postcode 6056 State or territory Western Australia (WA) Region North West Suburbs Add a free Greenmount business listing More business listings in Greenmount Businesses in GreenmountGreenmount Primary School50-68 Innamincka Rd · 08 92941155St Anthony's School96 Innamincka Rd · 08 92551133 Common questionsWhat is the postcode for Greenmount?Greenmount, WA has the postcode 6056.What state is Greenmount in?Greenmount is in Western Australia (WA).Does postcode 6056 cover more than one suburb?Yes. Postcode 6056 covers 17 localities, so the postcode alone does not identify Greenmount. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.