Home Postcode finder NSW Calga Calga postcode NSW Calga is a locality in New South Wales covered by postcode 2250. Postcode 2250 State or territory New South Wales (NSW) Region Gosford Add a free Calga business listing Be the first listing in Calga Common questionsWhat is the postcode for Calga?Calga, NSW has the postcode 2250.What state is Calga in?Calga is in New South Wales (NSW).Does postcode 2250 cover more than one suburb?Yes. Postcode 2250 covers 34 localities, so the postcode alone does not identify Calga. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.