Home Postcode finder QLD Marmadua Marmadua postcode QLD Marmadua is a locality in Queensland covered by postcode 4405. Postcode 4405 State or territory Queensland (QLD) Region Toowoomba Region Add a free Marmadua business listing Be the first listing in Marmadua Common questionsWhat is the postcode for Marmadua?Marmadua, QLD has the postcode 4405.What state is Marmadua in?Marmadua is in Queensland (QLD).Does postcode 4405 cover more than one suburb?Yes. Postcode 4405 covers 11 localities, so the postcode alone does not identify Marmadua. Browse other postcodes in Queensland, or widen the search to every Australian postcode.