Home Postcode finder SA Happy Valley Happy Valley postcode SA Happy Valley is a locality in South Australia covered by postcode 5159. Postcode 5159 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Happy Valley business listing More business listings in Happy Valley Businesses in Happy ValleyBraeview Junior Primary School1a Montana Drive · 08 83812966Braeview Primary School1a Montana Drive · 08 83812966Happy Valley Junior Primary School18 Education Rd · 08 83817166 Common questionsWhat is the postcode for Happy Valley?Happy Valley, SA has the postcode 5159.What state is Happy Valley in?Happy Valley is in South Australia (SA).Does postcode 5159 cover more than one suburb?Yes. Postcode 5159 covers 4 localities, so the postcode alone does not identify Happy Valley. Browse other postcodes in South Australia, or widen the search to every Australian postcode.