Home Postcodes by state SA 5412 Postcode 5412 5412 is the postcode for 4 localities in SA: Navan, Rhynie, Riverton and Woolshed Flat. Localities with postcode 5412NavanSARhynieSARivertonSAWoolshed FlatSA Postcode 5412 State or territory South Australia (SA) Localities 4 Council area Clare and Gilbert Valleys Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5411 · Postcode 5413