Home Postcodes by state ACT 2601 Postcode 2601 2601 is the postcode for 3 localities in ACT: Acton, Black Mountain and Canberra. Localities with postcode 2601ActonACTBlack MountainACTCanberraACT Postcode 2601 State or territory Australian Capital Territory (ACT) Localities 3 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 2600 · Postcode 2602