Home Postcodes by state QLD 4611 Postcode 4611 4611 is the postcode for 2 localities in QLD: Marshlands and Mondure. Localities with postcode 4611MarshlandsQLDMondureQLD Postcode 4611 State or territory Queensland (QLD) Localities 2 Council area South Burnett Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4610 · Postcode 4612