Home Postcodes by state NSW 2178 Postcode 2178 2178 is the postcode for 3 localities in NSW: Cecil Park, Kemps Creek and Mount Vernon. Localities with postcode 2178Cecil ParkNSWKemps CreekNSWMount VernonNSW Postcode 2178 State or territory New South Wales (NSW) Localities 3 Council area Fairfield; Mainly Liverpool, partly Penrith; Penrith Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2177 · Postcode 2179