Home Postcode finder SA Porter Lagoon Porter Lagoon postcode SA Porter Lagoon is a locality in South Australia covered by postcode 5416. Postcode 5416 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Porter Lagoon business listing Be the first listing in Porter Lagoon Common questionsWhat is the postcode for Porter Lagoon?Porter Lagoon, SA has the postcode 5416.What state is Porter Lagoon in?Porter Lagoon is in South Australia (SA).Does postcode 5416 cover more than one suburb?Yes. Postcode 5416 covers 2 localities, so the postcode alone does not identify Porter Lagoon. Browse other postcodes in South Australia, or widen the search to every Australian postcode.