Home Postcode finder QLD Cow Bay Cow Bay postcode QLD Cow Bay is a locality in Queensland covered by postcode 4873. Postcode 4873 State or territory Queensland (QLD) Region North QLD Add a free Cow Bay business listing Be the first listing in Cow Bay Common questionsWhat is the postcode for Cow Bay?Cow Bay, QLD has the postcode 4873.What state is Cow Bay in?Cow Bay is in Queensland (QLD).Does postcode 4873 cover more than one suburb?Yes. Postcode 4873 covers 29 localities, so the postcode alone does not identify Cow Bay. Browse other postcodes in Queensland, or widen the search to every Australian postcode.