Home Postcode finder SA Allendale East Allendale East postcode SA Allendale East is a locality in South Australia covered by postcode 5291. Postcode 5291 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Allendale East business listing More business listings in Allendale East Businesses in Allendale EastAllendale East Area SchoolBay Rd · 08 87387218Book Tasmania AccommodationPO Box 685 · 0415377603 Common questionsWhat is the postcode for Allendale East?Allendale East, SA has the postcode 5291.What state is Allendale East in?Allendale East is in South Australia (SA).Does postcode 5291 cover more than one suburb?Yes. Postcode 5291 covers 34 localities, so the postcode alone does not identify Allendale East. Browse other postcodes in South Australia, or widen the search to every Australian postcode.