Home Postcode finder SA Willalo Willalo postcode SA Willalo is a locality in South Australia covered by postcode 5419. Postcode 5419 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Willalo business listing Be the first listing in Willalo Common questionsWhat is the postcode for Willalo?Willalo, SA has the postcode 5419.What state is Willalo in?Willalo is in South Australia (SA).Does postcode 5419 cover more than one suburb?Yes. Postcode 5419 covers 7 localities, so the postcode alone does not identify Willalo. Browse other postcodes in South Australia, or widen the search to every Australian postcode.