wilmington postcode sa Home ›› Postcode Finder ›› SA ›› Wilmington Wilmington local listingsThe suburb of Wilmington is located in SA and has a postcode of 5485. Free wilmington business listing! 1Wilmington Primary School14 Fifth St 08 86675112 View more business listings in wilmington Search and find other Postcodes in South Australia or widen the search to Postcodes in Australia.