Home Postcode finder SA Iron Knob Iron Knob postcode SA Iron Knob is a locality in South Australia covered by postcode 5601. Postcode 5601 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Iron Knob business listing Be the first listing in Iron Knob Common questionsWhat is the postcode for Iron Knob?Iron Knob, SA has the postcode 5601.What state is Iron Knob in?Iron Knob is in South Australia (SA).Does postcode 5601 cover more than one suburb?No. Postcode 5601 covers Iron Knob only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in South Australia, or widen the search to every Australian postcode.