northam postcode wa Home ›› Postcode Finder ›› WA ›› Northam Northam local listingsThe suburb of Northam is located in WA and has a postcode of 6401. Free northam business listing! 1Northam Senior High SchoolKennedy St 08 962100002St Joseph's SchoolWellington St 08 962277243Avondale Education Support Centre69 Hutt St 08 96223610 View more business listings in northam Search and find other Postcodes in Western Australia or widen the search to Postcodes in Australia.