Home Postcode finder SA Allendale North Allendale North postcode SA Allendale North is a locality in South Australia covered by postcode 5373. Postcode 5373 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Allendale North business listing Be the first listing in Allendale North Common questionsWhat is the postcode for Allendale North?Allendale North, SA has the postcode 5373.What state is Allendale North in?Allendale North is in South Australia (SA).Does postcode 5373 cover more than one suburb?Yes. Postcode 5373 covers 8 localities, so the postcode alone does not identify Allendale North. Browse other postcodes in South Australia, or widen the search to every Australian postcode.