Home Postcode finder NSWDL Stewarts Brook Stewarts Brook postcode NSWDL Stewarts Brook is a locality in New South Wales covered by postcode 2337. Postcode 2337 State or territory New South Wales (NSWDL) Region Hunter Add a free Stewarts Brook business listing Be the first listing in Stewarts Brook Common questionsWhat is the postcode for Stewarts Brook?Stewarts Brook, NSWDL has the postcode 2337.What state is Stewarts Brook in?Stewarts Brook is in New South Wales (NSWDL).Does postcode 2337 cover more than one suburb?Yes. Postcode 2337 covers 25 localities, so the postcode alone does not identify Stewarts Brook. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.