Home Postcode finder SA Monash Monash postcode SA Monash is a locality in South Australia covered by postcode 5342. Postcode 5342 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Monash business listing More business listings in Monash Businesses in MonashMonash Primary School22 Jackson St · 08 85835361 Common questionsWhat is the postcode for Monash?Monash, SA has the postcode 5342.What state is Monash in?Monash is in South Australia (SA).Does postcode 5342 cover more than one suburb?No. Postcode 5342 covers Monash only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in South Australia, or widen the search to every Australian postcode.