Home Postcode finder QLD Whetstone Whetstone postcode QLD Whetstone is a locality in Queensland covered by postcode 4387. Postcode 4387 State or territory Queensland (QLD) Region Toowoomba Region Add a free Whetstone business listing Be the first listing in Whetstone Common questionsWhat is the postcode for Whetstone?Whetstone, QLD has the postcode 4387.What state is Whetstone in?Whetstone is in Queensland (QLD).Does postcode 4387 cover more than one suburb?Yes. Postcode 4387 covers 9 localities, so the postcode alone does not identify Whetstone. Browse other postcodes in Queensland, or widen the search to every Australian postcode.