Home Postcodes by state QLD 4388 Postcode 4388 4388 is the postcode for 2 localities in QLD: Kurumbul and Yelarbon. Localities with postcode 4388KurumbulQLDYelarbonQLD Postcode 4388 State or territory Queensland (QLD) Localities 2 Council area Goondiwindi Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4387 · Postcode 4390