Home Postcode finder VIC Yannathan Yannathan postcode VIC Yannathan is a locality in Victoria covered by postcode 3981. Postcode 3981 State or territory Victoria (VIC) Region Frankston Add a free Yannathan business listing Be the first listing in Yannathan Common questionsWhat is the postcode for Yannathan?Yannathan, VIC has the postcode 3981.What state is Yannathan in?Yannathan is in Victoria (VIC).Does postcode 3981 cover more than one suburb?Yes. Postcode 3981 covers 7 localities, so the postcode alone does not identify Yannathan. Browse other postcodes in Victoria, or widen the search to every Australian postcode.