Home Postcode finder NSW Glendon Brook Glendon Brook postcode NSW Glendon Brook is a locality in New South Wales covered by postcode 2330. Postcode 2330 State or territory New South Wales (NSW) Region Hunter Add a free Glendon Brook business listing Be the first listing in Glendon Brook Common questionsWhat is the postcode for Glendon Brook?Glendon Brook, NSW has the postcode 2330.What state is Glendon Brook in?Glendon Brook is in New South Wales (NSW).Does postcode 2330 cover more than one suburb?Yes. Postcode 2330 covers 63 localities, so the postcode alone does not identify Glendon Brook. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.