Home Postcode finder VIC Jackass Flat Jackass Flat postcode VIC Jackass Flat is a locality in Victoria covered by postcode 3556. Postcode 3556 State or territory Victoria (VIC) Region Vic Country Add a free Jackass Flat business listing Be the first listing in Jackass Flat Common questionsWhat is the postcode for Jackass Flat?Jackass Flat, VIC has the postcode 3556.What state is Jackass Flat in?Jackass Flat is in Victoria (VIC).Does postcode 3556 cover more than one suburb?Yes. Postcode 3556 covers 10 localities, so the postcode alone does not identify Jackass Flat. Browse other postcodes in Victoria, or widen the search to every Australian postcode.