highgate postcode wa Home ›› Postcode Finder ›› WA ›› Highgate Highgate local listingsThe suburb of Highgate is located in WA and has a postcode of 6003. Free highgate business listing! 1St Mark's International College375 Stirling St 08 922798882Highgate Primary School147 Lincoln St 08 932842013Sacred Heart Primary School40 Mary St 08 93288817 View more business listings in highgate Search and find other Postcodes in Western Australia or widen the search to Postcodes in Australia.