Home Postcode finder WA Mullewa Mullewa postcode WA Mullewa is a locality in Western Australia covered by postcode 6630. Postcode 6630 State or territory Western Australia (WA) Region Wa Subs 4 Coast Add a free Mullewa business listing More business listings in Mullewa Businesses in MullewaMullewa District High School58 Jose St · 08 99611114Our Lady of Mt Carmel Primary School10 Doney St · 08 99611120 Common questionsWhat is the postcode for Mullewa?Mullewa, WA has the postcode 6630.What state is Mullewa in?Mullewa is in Western Australia (WA).Does postcode 6630 cover more than one suburb?Yes. Postcode 6630 covers 8 localities, so the postcode alone does not identify Mullewa. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.