Home Postcode finder SA Napperby Napperby postcode SA Napperby is a locality in South Australia covered by postcode 5540. Postcode 5540 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Napperby business listing More business listings in Napperby Businesses in NapperbyNapperby Primary SchoolOaks Rd · 08 86344309 Common questionsWhat is the postcode for Napperby?Napperby, SA has the postcode 5540.What state is Napperby in?Napperby is in South Australia (SA).Does postcode 5540 cover more than one suburb?Yes. Postcode 5540 covers 14 localities, so the postcode alone does not identify Napperby. Browse other postcodes in South Australia, or widen the search to every Australian postcode.