Home Postcode finder QLD Pirrinuan Pirrinuan postcode QLD Pirrinuan is a locality in Queensland covered by postcode 4405. Postcode 4405 State or territory Queensland (QLD) Region Toowoomba Region Add a free Pirrinuan business listing Be the first listing in Pirrinuan Common questionsWhat is the postcode for Pirrinuan?Pirrinuan, QLD has the postcode 4405.What state is Pirrinuan in?Pirrinuan 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 Pirrinuan. Browse other postcodes in Queensland, or widen the search to every Australian postcode.