Home Postcode finder SA Mount Barker Mount Barker postcode SA Mount Barker is a locality in South Australia covered by postcode 5251. Postcode 5251 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Mount Barker business listing More business listings in Mount Barker Businesses in Mount BarkerAustralian Paving Centre APC4 Oborn Rd · +61 8 8391 3467Australian Paving Centre Mt Barker - Murray Bridge98 Alexandrina Road, Mount Barker SA, Australia · (08) 8391 3467Cornerstone College68 Adelaide Rd · 08 83982566 Common questionsWhat is the postcode for Mount Barker?Mount Barker, SA has the postcode 5251.What state is Mount Barker in?Mount Barker is in South Australia (SA).Does postcode 5251 cover more than one suburb?Yes. Postcode 5251 covers 6 localities, so the postcode alone does not identify Mount Barker. Browse other postcodes in South Australia, or widen the search to every Australian postcode.