Home Postcode finder WA Nomans Lake Nomans Lake postcode WA Nomans Lake 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 Nomans Lake business listing Be the first listing in Nomans Lake Common questionsWhat is the postcode for Nomans Lake?Nomans Lake, WA has the postcode 6312.What state is Nomans Lake in?Nomans Lake 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 Nomans Lake. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.