Home Postcode finder QLD Picnic Bay Picnic Bay postcode QLD Picnic Bay is a locality in Queensland covered by postcode 4819. Postcode 4819 State or territory Queensland (QLD) Region North QLD Add a free Picnic Bay business listing More business listings in Picnic Bay Businesses in Picnic BayCstay Magnetic Island32 Picnic Street · (07) 4758 1616 Common questionsWhat is the postcode for Picnic Bay?Picnic Bay, QLD has the postcode 4819.What state is Picnic Bay in?Picnic Bay is in Queensland (QLD).Does postcode 4819 cover more than one suburb?Yes. Postcode 4819 covers 7 localities, so the postcode alone does not identify Picnic Bay. Browse other postcodes in Queensland, or widen the search to every Australian postcode.