Home Postcodes by state VIC 3173 Postcode 3173 3173 is the postcode for Keysborough, VIC. Localities with postcode 3173KeysboroughVIC Postcode 3173 State or territory Victoria (VIC) Localities 1 Council area Greater Dandenong Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 3172 · Postcode 3174