boulder postcode wa Home ›› Postcode Finder ›› WA ›› Boulder Boulder local listingsThe suburb of Boulder is located in WA and has a postcode of 6432. Free boulder business listing! 1O'Connor Education Support CentreJohnston St 08 909191142Boulder Primary SchoolLane St 08 909312953O'Connor Primary SchoolJohnston St 08 90919097 View more business listings in boulder Search and find other Postcodes in Western Australia or widen the search to Postcodes in Australia.