Home Postcode finder WA Northam Northam postcode WA Northam is a locality in Western Australia covered by postcode 6401. Postcode 6401 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Northam business listing More business listings in Northam Businesses in NorthamAvondale Education Support Centre69 Hutt St · 08 96223610Avondale Primary SchoolHutt St · 08 96221489Bodiam300 Colebatch Street · 08 9622 1632 Common questionsWhat is the postcode for Northam?Northam, WA has the postcode 6401.What state is Northam in?Northam is in Western Australia (WA).Does postcode 6401 cover more than one suburb?Yes. Postcode 6401 covers 18 localities, so the postcode alone does not identify Northam. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.