semaphore postcode sa Home ›› Postcode Finder ›› SA ›› Semaphore Semaphore local listingsThe suburb of Semaphore is located in SA and has a postcode of 5019. Free semaphore business listing! 1Dominican Primary School237 Military Rd 08 844963002WestSide Flowers39 Semaphore Road, Semaphore SA 5019, Australia 04526618373J & B Tree Service31 Benson Street, Semaphore SA 5019, Australia 0414 223 870 View more business listings in semaphore Search and find other Postcodes in South Australia or widen the search to Postcodes in Australia.