Home Postcode finder VIC Browns Plains Browns Plains postcode VIC Browns Plains is a locality in Victoria covered by postcode 3685. Postcode 3685 State or territory Victoria (VIC) Region Vic Far Country Add a free Browns Plains business listing Be the first listing in Browns Plains Common questionsWhat is the postcode for Browns Plains?Browns Plains, VIC has the postcode 3685.What state is Browns Plains in?Browns Plains is in Victoria (VIC).Does postcode 3685 cover more than one suburb?Yes. Postcode 3685 covers 9 localities, so the postcode alone does not identify Browns Plains. Browse other postcodes in Victoria, or widen the search to every Australian postcode.