Cowan is a small outer suburb of Sydney, in the state of New South Wales, Australia, approximately 40 kilometres north of the Sydney ce…Cowan is a small outer suburb of Sydney, in the state of New South Wales, Australia, approximately 40 kilometres north of the Sydney central business district, in the local government area of Hornsby Shire. Cowan shares the postcode of 2081 with Berowra. Brooklyn, which lies 6 kilometres to the north-east of Cowan, is considered the northernmost suburb of the Greater Sydney Metropolitan Area.
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