Home Postcode finder WA Waterloo Waterloo postcode WA Waterloo is a locality in Western Australia covered by postcode 6228. Postcode 6228 State or territory Western Australia (WA) Region Wa Subs 3 Sth Rd Add a free Waterloo business listing Be the first listing in Waterloo Common questionsWhat is the postcode for Waterloo?Waterloo, WA has the postcode 6228.What state is Waterloo in?Waterloo is in Western Australia (WA).Does postcode 6228 cover more than one suburb?No. Postcode 6228 covers Waterloo only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.