Home Postcode finder QLD Byfield Byfield postcode QLD Byfield is a locality in Queensland covered by postcode 4703. Postcode 4703 State or territory Queensland (QLD) Region Central QLD Add a free Byfield business listing More business listings in Byfield Businesses in ByfieldByfield State School2233 Byfield Rd · 07 49351140 Common questionsWhat is the postcode for Byfield?Byfield, QLD has the postcode 4703.What state is Byfield in?Byfield is in Queensland (QLD).Does postcode 4703 cover more than one suburb?Yes. Postcode 4703 covers 30 localities, so the postcode alone does not identify Byfield. Browse other postcodes in Queensland, or widen the search to every Australian postcode.