Home Postcode finder NSW Captains Flat Captains Flat postcode NSW Captains Flat is a locality in New South Wales covered by postcode 2623. Postcode 2623 State or territory New South Wales (NSW) Region Canberra Add a free Captains Flat business listing More business listings in Captains Flat Businesses in Captains FlatCaptains Flat Public SchoolMontgomery St · 02 62366253 Common questionsWhat is the postcode for Captains Flat?Captains Flat, NSW has the postcode 2623.What state is Captains Flat in?Captains Flat is in New South Wales (NSW).Does postcode 2623 cover more than one suburb?No. Postcode 2623 covers Captains Flat only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.