Home Postcode finder WA Northampton Northampton postcode WA Northampton is a locality in Western Australia covered by postcode 6535. Postcode 6535 State or territory Western Australia (WA) Region Wa Subs 4 Coast Add a free Northampton business listing More business listings in Northampton Businesses in NorthamptonNorthampton District High SchoolHarvey Rd · 08 99341183St Mary's School26 Mary St · 08 99341112 Common questionsWhat is the postcode for Northampton?Northampton, WA has the postcode 6535.What state is Northampton in?Northampton is in Western Australia (WA).Does postcode 6535 cover more than one suburb?Yes. Postcode 6535 covers 10 localities, so the postcode alone does not identify Northampton. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.