Home Postcode finder NSW Lake Munmorah Lake Munmorah postcode NSW Lake Munmorah is a locality in New South Wales covered by postcode 2259. Postcode 2259 State or territory New South Wales (NSW) Region Gosford Add a free Lake Munmorah business listing More business listings in Lake Munmorah Businesses in Lake MunmorahGreg James Garage Doors29 Fay Street · 0418434024Lake Munmorah High SchoolCharters Rd · 02 43581411Lake Munmorah Public SchoolPacific Hwy · 02 43581171 Common questionsWhat is the postcode for Lake Munmorah?Lake Munmorah, NSW has the postcode 2259.What state is Lake Munmorah in?Lake Munmorah is in New South Wales (NSW).Does postcode 2259 cover more than one suburb?Yes. Postcode 2259 covers 42 localities, so the postcode alone does not identify Lake Munmorah. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.