Home Postcode finder VIC Mountain Bay Mountain Bay postcode VIC Mountain Bay is a locality in Victoria covered by postcode 3723. Postcode 3723 State or territory Victoria (VIC) Region Vic Far Country Add a free Mountain Bay business listing Be the first listing in Mountain Bay Common questionsWhat is the postcode for Mountain Bay?Mountain Bay, VIC has the postcode 3723.What state is Mountain Bay in?Mountain Bay is in Victoria (VIC).Does postcode 3723 cover more than one suburb?Yes. Postcode 3723 covers 25 localities, so the postcode alone does not identify Mountain Bay. Browse other postcodes in Victoria, or widen the search to every Australian postcode.