Home Postcode finder SA Little Douglas Little Douglas postcode SA Little Douglas is a locality in South Australia covered by postcode 5607. Postcode 5607 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Little Douglas business listing Be the first listing in Little Douglas Common questionsWhat is the postcode for Little Douglas?Little Douglas, SA has the postcode 5607.What state is Little Douglas in?Little Douglas is in South Australia (SA).Does postcode 5607 cover more than one suburb?Yes. Postcode 5607 covers 50 localities, so the postcode alone does not identify Little Douglas. Browse other postcodes in South Australia, or widen the search to every Australian postcode.