Home Postcode finder VIC Westby Westby postcode VIC Westby is a locality in Victoria covered by postcode 3579. Postcode 3579 State or territory Victoria (VIC) Region Vic Far Country Add a free Westby business listing Be the first listing in Westby Common questionsWhat is the postcode for Westby?Westby, VIC has the postcode 3579.What state is Westby in?Westby is in Victoria (VIC).Does postcode 3579 cover more than one suburb?Yes. Postcode 3579 covers 29 localities, so the postcode alone does not identify Westby. Browse other postcodes in Victoria, or widen the search to every Australian postcode.