Home Postcode finder NSWDL Allynbrook Allynbrook postcode NSWDL Allynbrook is a locality in New South Wales covered by postcode 2311. Postcode 2311 State or territory New South Wales (NSWDL) Region Hunter Add a free Allynbrook business listing Be the first listing in Allynbrook Common questionsWhat is the postcode for Allynbrook?Allynbrook, NSWDL has the postcode 2311.What state is Allynbrook in?Allynbrook is in New South Wales (NSWDL).Does postcode 2311 cover more than one suburb?Yes. Postcode 2311 covers 11 localities, so the postcode alone does not identify Allynbrook. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.