Home Postcode finder QLD Croftby Croftby postcode QLD Croftby is a locality in Queensland covered by postcode 4310. Postcode 4310 State or territory Queensland (QLD) Region Western Suburbs Add a free Croftby business listing Be the first listing in Croftby Common questionsWhat is the postcode for Croftby?Croftby, QLD has the postcode 4310.What state is Croftby in?Croftby is in Queensland (QLD).Does postcode 4310 cover more than one suburb?Yes. Postcode 4310 covers 26 localities, so the postcode alone does not identify Croftby. Browse other postcodes in Queensland, or widen the search to every Australian postcode.