Home Postcode finder NSWDL Spring Flat Spring Flat postcode NSWDL Spring Flat is a locality in New South Wales covered by postcode 2850. Postcode 2850 State or territory New South Wales (NSWDL) Region NSW Country West Add a free Spring Flat business listing Be the first listing in Spring Flat Common questionsWhat is the postcode for Spring Flat?Spring Flat, NSWDL has the postcode 2850.What state is Spring Flat in?Spring Flat is in New South Wales (NSWDL).Does postcode 2850 cover more than one suburb?Yes. Postcode 2850 covers 77 localities, so the postcode alone does not identify Spring Flat. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.