Home Postcodes by state NSW 2099 Postcode 2099 2099 is the postcode for 4 localities in NSW: Cromer, Dee Why, Narraweena and North Curl Curl. Localities with postcode 2099CromerNSWDee WhyNSWNarraweenaNSWNorth Curl CurlNSW Postcode 2099 State or territory New South Wales (NSW) Localities 4 Council area Northern Beaches Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2097 · Postcode 2100