Home Postcode finder SA Monteith Monteith postcode SA Monteith is a locality in South Australia covered by postcode 5254. Postcode 5254 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Monteith business listing Be the first listing in Monteith Common questionsWhat is the postcode for Monteith?Monteith, SA has the postcode 5254.What state is Monteith in?Monteith is in South Australia (SA).Does postcode 5254 cover more than one suburb?Yes. Postcode 5254 covers 12 localities, so the postcode alone does not identify Monteith. Browse other postcodes in South Australia, or widen the search to every Australian postcode.