Home Postcode finder NSW Glenning Valley Glenning Valley postcode NSW Glenning Valley is a locality in New South Wales covered by postcode 2261. Postcode 2261 State or territory New South Wales (NSW) Region Gosford Add a free Glenning Valley business listing Be the first listing in Glenning Valley Common questionsWhat is the postcode for Glenning Valley?Glenning Valley, NSW has the postcode 2261.What state is Glenning Valley in?Glenning Valley is in New South Wales (NSW).Does postcode 2261 cover more than one suburb?Yes. Postcode 2261 covers 15 localities, so the postcode alone does not identify Glenning Valley. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.