Home Postcodes by state SA 5136 Postcode 5136 5136 is the postcode for Norton Summit, SA. Localities with postcode 5136Norton SummitSA Postcode 5136 State or territory South Australia (SA) Localities 1 Council area Adelaide Hills Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5134 · Postcode 5137