Home Postcode finder VIC Johnsonville Johnsonville postcode VIC Johnsonville is a locality in Victoria covered by postcode 3902. Postcode 3902 State or territory Victoria (VIC) Region Vic Far Country Add a free Johnsonville business listing Be the first listing in Johnsonville Common questionsWhat is the postcode for Johnsonville?Johnsonville, VIC has the postcode 3902.What state is Johnsonville in?Johnsonville is in Victoria (VIC).Does postcode 3902 cover more than one suburb?Yes. Postcode 3902 covers 2 localities, so the postcode alone does not identify Johnsonville. Browse other postcodes in Victoria, or widen the search to every Australian postcode.