Home Postcode finder SA Semaphore Semaphore postcode SA Semaphore is a locality in South Australia covered by postcode 5019. Postcode 5019 State or territory South Australia (SA) Region Adelaide Add a free Semaphore business listing More business listings in Semaphore Businesses in SemaphoreDominican Primary School237 Military Rd · 08 84496300J & B Tree Service31 Benson Street, Semaphore SA 5019, Australia · 0414 223 870WestSide Flowers39 Semaphore Road, Semaphore SA 5019, Australia · 0452661837 Common questionsWhat is the postcode for Semaphore?Semaphore, SA has the postcode 5019.What state is Semaphore in?Semaphore is in South Australia (SA).Does postcode 5019 cover more than one suburb?Yes. Postcode 5019 covers 4 localities, so the postcode alone does not identify Semaphore. Browse other postcodes in South Australia, or widen the search to every Australian postcode.