Home Postcode finder SA Sleaford Sleaford postcode SA Sleaford 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 Sleaford business listing Be the first listing in Sleaford Common questionsWhat is the postcode for Sleaford?Sleaford, SA has the postcode 5607.What state is Sleaford in?Sleaford 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 Sleaford. Browse other postcodes in South Australia, or widen the search to every Australian postcode.