Home Postcode finder NSWDL Allandale Allandale postcode NSWDL Allandale is a locality in New South Wales covered by postcode 2320. Postcode 2320 State or territory New South Wales (NSWDL) Region Hunter Add a free Allandale business listing Be the first listing in Allandale Common questionsWhat is the postcode for Allandale?Allandale, NSWDL has the postcode 2320.What state is Allandale in?Allandale is in New South Wales (NSWDL).Does postcode 2320 cover more than one suburb?Yes. Postcode 2320 covers 30 localities, so the postcode alone does not identify Allandale. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.