Home Postcode finder VIC Howitt Plains Howitt Plains postcode VIC Howitt Plains is a locality in Victoria covered by postcode 3858. Postcode 3858 State or territory Victoria (VIC) Region Vic Far Country Add a free Howitt Plains business listing Be the first listing in Howitt Plains Common questionsWhat is the postcode for Howitt Plains?Howitt Plains, VIC has the postcode 3858.What state is Howitt Plains in?Howitt Plains is in Victoria (VIC).Does postcode 3858 cover more than one suburb?Yes. Postcode 3858 covers 20 localities, so the postcode alone does not identify Howitt Plains. Browse other postcodes in Victoria, or widen the search to every Australian postcode.