Home Postcode finder QLD St Agnes St Agnes postcode QLD St Agnes is a locality in Queensland covered by postcode 4671. Postcode 4671 State or territory Queensland (QLD) Region Sunshine Coast Add a free St Agnes business listing Be the first listing in St Agnes Common questionsWhat is the postcode for St Agnes?St Agnes, QLD has the postcode 4671.What state is St Agnes in?St Agnes is in Queensland (QLD).Does postcode 4671 cover more than one suburb?Yes. Postcode 4671 covers 35 localities, so the postcode alone does not identify St Agnes. Browse other postcodes in Queensland, or widen the search to every Australian postcode.