Home Postcodes by state NSW 2108 Postcode 2108 2108 is the postcode for 3 localities in NSW: Coasters Retreat, Great Mackerel Beach and Palm Beach. Localities with postcode 2108Coasters RetreatNSWGreat Mackerel BeachNSWPalm BeachNSW Postcode 2108 State or territory New South Wales (NSW) Localities 3 Council area Northern Beaches Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2107 · Postcode 2110