Home Postcode finder WA Nillup Nillup postcode WA Nillup is a locality in Western Australia covered by postcode 6288. Postcode 6288 State or territory Western Australia (WA) Region Wa Subs 3 Sth Rd Add a free Nillup business listing Be the first listing in Nillup Common questionsWhat is the postcode for Nillup?Nillup, WA has the postcode 6288.What state is Nillup in?Nillup is in Western Australia (WA).Does postcode 6288 cover more than one suburb?Yes. Postcode 6288 covers 7 localities, so the postcode alone does not identify Nillup. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.