Home Postcode finder WA Mount Barker Mount Barker postcode WA Mount Barker is a locality in Western Australia covered by postcode 6324. Postcode 6324 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Mount Barker business listing More business listings in Mount Barker Businesses in Mount BarkerMt Barker Community CollegeWoongenellup Rd · 08 98513400Mt Barker Community College12 Oatlands Rd · 08 98513400South Stirling Primary SchoolSouth Stirling via · 08 98543037 Common questionsWhat is the postcode for Mount Barker?Mount Barker, WA has the postcode 6324.What state is Mount Barker in?Mount Barker is in Western Australia (WA).Does postcode 6324 cover more than one suburb?Yes. Postcode 6324 covers 8 localities, so the postcode alone does not identify Mount Barker. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.