Home Postcodes by state QLD 4205 Postcode 4205 4205 is the postcode for Bethania, QLD. Localities with postcode 4205BethaniaQLD Postcode 4205 State or territory Queensland (QLD) Localities 1 Council area Logan Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4184 · Postcode 4207