Home Postcodes by state SA 5606 Postcode 5606 5606 is the postcode for 2 localities in SA: Kirton Point and Port Lincoln. Localities with postcode 5606Kirton PointSAPort LincolnSA Postcode 5606 State or territory South Australia (SA) Localities 2 Council area Port Lincoln Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5605 · Postcode 5607