Home Postcode finder QLD Chirnside Chirnside postcode QLD Chirnside is a locality in Queensland covered by postcode 4723. Postcode 4723 State or territory Queensland (QLD) Region Central QLD Add a free Chirnside business listing Be the first listing in Chirnside Common questionsWhat is the postcode for Chirnside?Chirnside, QLD has the postcode 4723.What state is Chirnside in?Chirnside is in Queensland (QLD).Does postcode 4723 cover more than one suburb?Yes. Postcode 4723 covers 11 localities, so the postcode alone does not identify Chirnside. Browse other postcodes in Queensland, or widen the search to every Australian postcode.