Home Postcodes by state NSW 2100 Postcode 2100 2100 is the postcode for 6 localities in NSW: Allambie Heights, Beacon Hill, Brookvale, North Manly, Oxford Falls and Warringah Mall. Localities with postcode 2100Allambie HeightsNSWBeacon HillNSWBrookvaleNSWNorth ManlyNSWOxford FallsNSWWarringah MallNSW Postcode 2100 State or territory New South Wales (NSW) Localities 6 Council area Northern Beaches Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2099 · Postcode 2101