Home Postcode finder QLD Killarney Killarney postcode QLD Killarney is a locality in Queensland covered by postcode 4373. Postcode 4373 State or territory Queensland (QLD) Region Toowoomba Region Add a free Killarney business listing More business listings in Killarney Businesses in KillarneyKillarney State School7 Acacia St · 07 46646333 Common questionsWhat is the postcode for Killarney?Killarney, QLD has the postcode 4373.What state is Killarney in?Killarney is in Queensland (QLD).Does postcode 4373 cover more than one suburb?Yes. Postcode 4373 covers 3 localities, so the postcode alone does not identify Killarney. Browse other postcodes in Queensland, or widen the search to every Australian postcode.