Home Postcode finder VIC Granite Rock Granite Rock postcode VIC Granite Rock is a locality in Victoria covered by postcode 3875. Postcode 3875 State or territory Victoria (VIC) Region Vic Far Country Add a free Granite Rock business listing Be the first listing in Granite Rock Common questionsWhat is the postcode for Granite Rock?Granite Rock, VIC has the postcode 3875.What state is Granite Rock in?Granite Rock is in Victoria (VIC).Does postcode 3875 cover more than one suburb?Yes. Postcode 3875 covers 34 localities, so the postcode alone does not identify Granite Rock. Browse other postcodes in Victoria, or widen the search to every Australian postcode.