Home Postcodes by state WA 6337 Postcode 6337 6337 is the postcode for 5 localities in WA: Fitzgerald, Gairdner, Jacup, Jerramungup and West Fitzgerald. Localities with postcode 6337FitzgeraldWAGairdnerWAJacupWAJerramungupWAWest FitzgeraldWA Postcode 6337 State or territory Western Australia (WA) Localities 5 Council area Ravensthorpe; Jerramungup Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6336 · Postcode 6338