Home Postcode finder QLD Eureka Eureka postcode QLD Eureka is a locality in Queensland covered by postcode 4660. Postcode 4660 State or territory Queensland (QLD) Region Sunshine Coast Add a free Eureka business listing Be the first listing in Eureka Common questionsWhat is the postcode for Eureka?Eureka, QLD has the postcode 4660.What state is Eureka in?Eureka is in Queensland (QLD).Does postcode 4660 cover more than one suburb?Yes. Postcode 4660 covers 21 localities, so the postcode alone does not identify Eureka. Browse other postcodes in Queensland, or widen the search to every Australian postcode.