Home Postcode finder VIC Castle Creek Castle Creek postcode VIC Castle Creek is a locality in Victoria covered by postcode 3691. Postcode 3691 State or territory Victoria (VIC) Region Vic Far Country Add a free Castle Creek business listing Be the first listing in Castle Creek Common questionsWhat is the postcode for Castle Creek?Castle Creek, VIC has the postcode 3691.What state is Castle Creek in?Castle Creek is in Victoria (VIC).Does postcode 3691 cover more than one suburb?Yes. Postcode 3691 covers 34 localities, so the postcode alone does not identify Castle Creek. It also appears in 2 states or territories, so it does not identify a state either. Browse other postcodes in Victoria, or widen the search to every Australian postcode.