Home Postcode finder NSW Martinsville Martinsville postcode NSW Martinsville is a locality in New South Wales covered by postcode 2265. Postcode 2265 State or territory New South Wales (NSW) Region Gosford Add a free Martinsville business listing Be the first listing in Martinsville Common questionsWhat is the postcode for Martinsville?Martinsville, NSW has the postcode 2265.What state is Martinsville in?Martinsville is in New South Wales (NSW).Does postcode 2265 cover more than one suburb?Yes. Postcode 2265 covers 2 localities, so the postcode alone does not identify Martinsville. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.