willaston postcode sa Home ›› Postcode Finder ›› SA ›› Willaston Willaston local listingsThe suburb of Willaston is located in SA and has a postcode of 5118. Free willaston business listing! 1Gawler Automatic Transmissions6 Little Paxton St 0885222558 View more business listings in willaston Search and find other Postcodes in South Australia or widen the search to Postcodes in Australia.