Home Postcode finder NSW Callaghan Callaghan postcode NSW Callaghan is a locality in New South Wales covered by postcode 2308. Postcode 2308 State or territory New South Wales (NSW) Region Hunter Add a free Callaghan business listing More business listings in Callaghan Businesses in CallaghanKooinda Work Based Child Care CentreUniversity of Newcastle University Drive · 02 4921 7171 KU Kintaiba Children's CentreUniversity of Newcastle University Drive · 02 4967 3475 KU Wonnayba Children's CentreUniversity of Newcastle University Drive · 02 4967 6488 Common questionsWhat is the postcode for Callaghan?Callaghan, NSW has the postcode 2308.What state is Callaghan in?Callaghan is in New South Wales (NSW).Does postcode 2308 cover more than one suburb?Yes. Postcode 2308 covers 2 localities, so the postcode alone does not identify Callaghan. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.