Home Postcode finder QLD Fassifern Fassifern postcode QLD Fassifern is a locality in Queensland covered by postcode 4309. Postcode 4309 State or territory Queensland (QLD) Region Western Suburbs Add a free Fassifern business listing Be the first listing in Fassifern Common questionsWhat is the postcode for Fassifern?Fassifern, QLD has the postcode 4309.What state is Fassifern in?Fassifern is in Queensland (QLD).Does postcode 4309 cover more than one suburb?Yes. Postcode 4309 covers 17 localities, so the postcode alone does not identify Fassifern. Browse other postcodes in Queensland, or widen the search to every Australian postcode.