Home Postcode finder SA Semaphore South Semaphore South postcode SA Semaphore South is a locality in South Australia covered by postcode 5019. Postcode 5019 State or territory South Australia (SA) Region Adelaide Add a free Semaphore South business listing More business listings in Semaphore South Businesses in Semaphore SouthLe Fevre High School90 Hart St · 08 84497004 Common questionsWhat is the postcode for Semaphore South?Semaphore South, SA has the postcode 5019.What state is Semaphore South in?Semaphore South 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 South. Browse other postcodes in South Australia, or widen the search to every Australian postcode.