Home Postcode finder SA Koolgera Koolgera postcode SA Koolgera is a locality in South Australia covered by postcode 5661. Postcode 5661 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Koolgera business listing Be the first listing in Koolgera Common questionsWhat is the postcode for Koolgera?Koolgera, SA has the postcode 5661.What state is Koolgera in?Koolgera is in South Australia (SA).Does postcode 5661 cover more than one suburb?Yes. Postcode 5661 covers 5 localities, so the postcode alone does not identify Koolgera. Browse other postcodes in South Australia, or widen the search to every Australian postcode.