Home Postcodes by state SA 5556 Postcode 5556 5556 is the postcode for 4 localities in SA: North Beach, Wallaroo, Wallaroo Plain and Warburto. Localities with postcode 5556North BeachSAWallarooSAWallaroo PlainSAWarburtoSA Postcode 5556 State or territory South Australia (SA) Localities 4 Council area Copper Coast Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5555 · Postcode 5558