Home Postcode finder QLD Koah Koah postcode QLD Koah is a locality in Queensland covered by postcode 4881. Postcode 4881 State or territory Queensland (QLD) Region North QLD Add a free Koah business listing Be the first listing in Koah Common questionsWhat is the postcode for Koah?Koah, QLD has the postcode 4881.What state is Koah in?Koah is in Queensland (QLD).Does postcode 4881 cover more than one suburb?Yes. Postcode 4881 covers 4 localities, so the postcode alone does not identify Koah. Browse other postcodes in Queensland, or widen the search to every Australian postcode.