Home Postcode finder SA Port Neill Port Neill postcode SA Port Neill is a locality in South Australia covered by postcode 5604. Postcode 5604 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Port Neill business listing More business listings in Port Neill Businesses in Port NeillPort Neill Primary SchoolWallis St · 08 86889029 Common questionsWhat is the postcode for Port Neill?Port Neill, SA has the postcode 5604.What state is Port Neill in?Port Neill is in South Australia (SA).Does postcode 5604 cover more than one suburb?No. Postcode 5604 covers Port Neill only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in South Australia, or widen the search to every Australian postcode.