Home Postcode finder QLD Gladstone Gladstone postcode QLD Gladstone is a locality in Queensland covered by postcode 4680. Postcode 4680 State or territory Queensland (QLD) Region Central QLD Add a free Gladstone business listing More business listings in Gladstone Businesses in Gladstone GTC Financial Services Pty 29 Roseberry Street · 07 4972 6349 Adbri Masonry21 Benaraby Road · (07) 4979 3355Arnold Development Consultants35 Lord Street · (07) 4962 0100 Common questionsWhat is the postcode for Gladstone?Gladstone, QLD has the postcode 4680.What state is Gladstone in?Gladstone is in Queensland (QLD).Does postcode 4680 cover more than one suburb?Yes. Postcode 4680 covers 41 localities, so the postcode alone does not identify Gladstone. Browse other postcodes in Queensland, or widen the search to every Australian postcode.