Home Postcode finder NSWDL Alison Alison postcode NSWDL Alison is a locality in New South Wales covered by postcode 2420. Postcode 2420 State or territory New South Wales (NSWDL) Region Hunter Add a free Alison business listing More business listings in Alison Businesses in AlisonTrakaid2 Yarramalong Rd · 203-925-8388 Common questionsWhat is the postcode for Alison?Alison, NSWDL has the postcode 2420.What state is Alison in?Alison is in New South Wales (NSWDL).Does postcode 2420 cover more than one suburb?Yes. Postcode 2420 covers 23 localities, so the postcode alone does not identify Alison. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.