Home Postcodes by state SA 5400 Postcode 5400 5400 is the postcode for 4 localities in SA: Magdala, Pinkerton Plains, Wasleys and Woolsheds. Localities with postcode 5400MagdalaSAPinkerton PlainsSAWasleysSAWoolshedsSA Postcode 5400 State or territory South Australia (SA) Localities 4 Council area Light Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5381 · Postcode 5401