Home Postcode finder QLD Innisplain Innisplain postcode QLD Innisplain is a locality in Queensland covered by postcode 4285. Postcode 4285 State or territory Queensland (QLD) Region Heathwood Add a free Innisplain business listing Be the first listing in Innisplain Common questionsWhat is the postcode for Innisplain?Innisplain, QLD has the postcode 4285.What state is Innisplain in?Innisplain is in Queensland (QLD).Does postcode 4285 cover more than one suburb?Yes. Postcode 4285 covers 33 localities, so the postcode alone does not identify Innisplain. Browse other postcodes in Queensland, or widen the search to every Australian postcode.