Home Postcodes by state SA 5373 Postcode 5373 5373 is the postcode for 8 localities in SA: Allendale North, Bagot Well, Bethel, Fords, Hamilton, Kapunda and 2 more. Localities with postcode 5373Allendale NorthSABagot WellSABethelSAFordsSAHamiltonSAKapundaSAKoonungaSASt JohnsSA Postcode 5373 State or territory South Australia (SA) Localities 8 Council area Light Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5372 · Postcode 5374