Home Postcodes by state SA 5416 Postcode 5416 5416 is the postcode for 2 localities in SA: Farrell Flat and Porter Lagoon. Localities with postcode 5416Farrell FlatSAPorter LagoonSA Postcode 5416 State or territory South Australia (SA) Localities 2 Council area Goyder Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5415 · Postcode 5417