Home Postcode finder NSW Newcastle Newcastle postcode NSW Newcastle is a locality in New South Wales covered by postcode 2300. Postcode 2300 State or territory New South Wales (NSW) Region Hunter Add a free Newcastle business listing More business listings in Newcastle Businesses in Newcastle4WD Supacentre - NewcastleShop 2, 2364 Pacific Highway, Heatherbrae, Newcastle, New South Wales, 2324 · 1800 88 39 64Affinity Accounting & Advisorysuite 1 level 1/1 Honeysuckle Drive, Newcastle NSW, Australia · +61 2 4092 1000AI Insurance Newcastle · 1300 00 33 03 Common questionsWhat is the postcode for Newcastle?Newcastle, NSW has the postcode 2300.What state is Newcastle in?Newcastle is in New South Wales (NSW).Does postcode 2300 cover more than one suburb?Yes. Postcode 2300 covers 5 localities, so the postcode alone does not identify Newcastle. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.