Home Postcode finder VIC Knowsley Knowsley postcode VIC Knowsley is a locality in Victoria covered by postcode 3523. Postcode 3523 State or territory Victoria (VIC) Region Vic Far Country Add a free Knowsley business listing Be the first listing in Knowsley Common questionsWhat is the postcode for Knowsley?Knowsley, VIC has the postcode 3523.What state is Knowsley in?Knowsley is in Victoria (VIC).Does postcode 3523 cover more than one suburb?Yes. Postcode 3523 covers 10 localities, so the postcode alone does not identify Knowsley. Browse other postcodes in Victoria, or widen the search to every Australian postcode.