Home Postcode finder SA Peep Hill Peep Hill postcode SA Peep Hill is a locality in South Australia covered by postcode 5374. Postcode 5374 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Peep Hill business listing Be the first listing in Peep Hill Common questionsWhat is the postcode for Peep Hill?Peep Hill, SA has the postcode 5374.What state is Peep Hill in?Peep Hill is in South Australia (SA).Does postcode 5374 cover more than one suburb?Yes. Postcode 5374 covers 15 localities, so the postcode alone does not identify Peep Hill. Browse other postcodes in South Australia, or widen the search to every Australian postcode.