Home Postcode finder WA Narrogin Valley Narrogin Valley postcode WA Narrogin Valley is a locality in Western Australia covered by postcode 6312. Postcode 6312 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Narrogin Valley business listing Be the first listing in Narrogin Valley Common questionsWhat is the postcode for Narrogin Valley?Narrogin Valley, WA has the postcode 6312.What state is Narrogin Valley in?Narrogin Valley is in Western Australia (WA).Does postcode 6312 cover more than one suburb?Yes. Postcode 6312 covers 9 localities, so the postcode alone does not identify Narrogin Valley. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.