Home Postcode finder VIC Bonnie Doon Bonnie Doon postcode VIC Bonnie Doon is a locality in Victoria covered by postcode 3720. Postcode 3720 State or territory Victoria (VIC) Region Vic Far Country Add a free Bonnie Doon business listing Be the first listing in Bonnie Doon Common questionsWhat is the postcode for Bonnie Doon?Bonnie Doon, VIC has the postcode 3720.What state is Bonnie Doon in?Bonnie Doon is in Victoria (VIC).Does postcode 3720 cover more than one suburb?No. Postcode 3720 covers Bonnie Doon only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in Victoria, or widen the search to every Australian postcode.