Home Postcode finder WA Reservoir Reservoir postcode WA Reservoir is a locality in Western Australia covered by postcode 6076. Postcode 6076 State or territory Western Australia (WA) Region North West Suburbs Add a free Reservoir business listing Be the first listing in Reservoir Common questionsWhat is the postcode for Reservoir?Reservoir, WA has the postcode 6076.What state is Reservoir in?Reservoir is in Western Australia (WA).Does postcode 6076 cover more than one suburb?Yes. Postcode 6076 covers 11 localities, so the postcode alone does not identify Reservoir. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.