Home Postcode finder VIC Trentham Trentham postcode VIC Trentham is a locality in Victoria covered by postcode 3458. Postcode 3458 State or territory Victoria (VIC) Region Vic Far Country Add a free Trentham business listing More business listings in Trentham Businesses in TrenthamTrentham and District Primary SchoolBridge St · 03 54241364 Common questionsWhat is the postcode for Trentham?Trentham, VIC has the postcode 3458.What state is Trentham in?Trentham is in Victoria (VIC).Does postcode 3458 cover more than one suburb?Yes. Postcode 3458 covers 9 localities, so the postcode alone does not identify Trentham. Browse other postcodes in Victoria, or widen the search to every Australian postcode.