Home Postcodes by state ACT 2904 Postcode 2904 2904 is the postcode for 4 localities in ACT: Fadden, Gowrie, Macarthur and Monash. Localities with postcode 2904FaddenACTGowrieACTMacarthurACTMonashACT Postcode 2904 State or territory Australian Capital Territory (ACT) Localities 4 Council area None: the ACT Government provides local services Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2903 · Postcode 2905