hewett postcode sa Home ›› Postcode Finder ›› SA ›› Hewett Hewett local listingsThe suburb of Hewett is located in SA and has a postcode of 5118. Free hewett business listing! 1Hewett Public SchoolKingfisher Drive 08 85221486 View more business listings in hewett Search and find other Postcodes in South Australia or widen the search to Postcodes in Australia.