Home Postcodes by state NSW 2623 Postcode 2623 2623 is the postcode for Captains Flat, NSW. Localities with postcode 2623Captains FlatNSW Postcode 2623 State or territory New South Wales (NSW) Localities 1 Council area Queanbeyan-Palerang Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2622 · Postcode 2624