Home Postcode finder QLD Kelvinhaugh Kelvinhaugh postcode QLD Kelvinhaugh is a locality in Queensland covered by postcode 4401. Postcode 4401 State or territory Queensland (QLD) Region Toowoomba Region Add a free Kelvinhaugh business listing Be the first listing in Kelvinhaugh Common questionsWhat is the postcode for Kelvinhaugh?Kelvinhaugh, QLD has the postcode 4401.What state is Kelvinhaugh in?Kelvinhaugh is in Queensland (QLD).Does postcode 4401 cover more than one suburb?Yes. Postcode 4401 covers 16 localities, so the postcode alone does not identify Kelvinhaugh. Browse other postcodes in Queensland, or widen the search to every Australian postcode.