Home Postcode finder VIC Osbornes Flat Osbornes Flat postcode VIC Osbornes Flat is a locality in Victoria covered by postcode 3691. Postcode 3691 State or territory Victoria (VIC) Region Vic Far Country Add a free Osbornes Flat business listing More business listings in Osbornes Flat Businesses in Osbornes FlatOsbornes Flat Primary SchoolOsbornes Flat Rd · 02 60271415 Common questionsWhat is the postcode for Osbornes Flat?Osbornes Flat, VIC has the postcode 3691.What state is Osbornes Flat in?Osbornes Flat is in Victoria (VIC).Does postcode 3691 cover more than one suburb?Yes. Postcode 3691 covers 34 localities, so the postcode alone does not identify Osbornes Flat. It also appears in 2 states or territories, so it does not identify a state either. Browse other postcodes in Victoria, or widen the search to every Australian postcode.