Home Postcode finder WA Onslow Onslow postcode WA Onslow is a locality in Western Australia covered by postcode 6710. Postcode 6710 State or territory Western Australia (WA) Region North West Suburbs Add a free Onslow business listing More business listings in Onslow Businesses in OnslowElite Maintenance PilbaraOnslow WA, Australia · 131580Joyce Krane691 Onslow Road, Onslow WA, Australia · (08) 7979 2312Onslow SchoolSimpson St · 08 91846062 Common questionsWhat is the postcode for Onslow?Onslow, WA has the postcode 6710.What state is Onslow in?Onslow is in Western Australia (WA).Does postcode 6710 cover more than one suburb?Yes. Postcode 6710 covers 5 localities, so the postcode alone does not identify Onslow. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.