Home Postcode finder SA Whyalla Whyalla postcode SA Whyalla is a locality in South Australia covered by postcode 5600. Postcode 5600 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Whyalla business listing More business listings in Whyalla Businesses in WhyallaJR Plumbing SAWhyalla Street · 0400 270 259Memorial Oval Primary School58 Bradford St · 08 86457991Samaritan College70 Gowrie Ave · 08 86458568 Common questionsWhat is the postcode for Whyalla?Whyalla, SA has the postcode 5600.What state is Whyalla in?Whyalla is in South Australia (SA).Does postcode 5600 cover more than one suburb?Yes. Postcode 5600 covers 13 localities, so the postcode alone does not identify Whyalla. Browse other postcodes in South Australia, or widen the search to every Australian postcode.