Home Postcodes by state QLD 4365 Postcode 4365 4365 is the postcode for Leyburn, QLD. Localities with postcode 4365LeyburnQLD Postcode 4365 State or territory Queensland (QLD) Localities 1 Council area Mainly Southern Downs, partly Toowoomba Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4364 · Postcode 4370