Home Postcode finder NSW Millfield Millfield postcode NSW Millfield is a locality in New South Wales covered by postcode 2325. Postcode 2325 State or territory New South Wales (NSW) Region Hunter Add a free Millfield business listing More business listings in Millfield Businesses in MillfieldMillfield Public SchoolWollombi Rd · 02 49981331Sweetmans Timber Pty Ltd339 Wollombi Road · 0249981224 Common questionsWhat is the postcode for Millfield?Millfield, NSW has the postcode 2325.What state is Millfield in?Millfield is in New South Wales (NSW).Does postcode 2325 cover more than one suburb?Yes. Postcode 2325 covers 27 localities, so the postcode alone does not identify Millfield. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.