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