Postcode 6336 This postcode covers more than one locality. Which one are you after? Cowalellup Western Australia LGA: Gnowangerup Mills Lake Western Australia LGA: Gnowangerup Mindarabin Western Australia LGA: Gnowangerup Needilup Western Australia LGA: Jerramungup Ongerup Western Australia LGA: Gnowangerup Toompup Western Australia LGA: Gnowangerup