Cook County was one of the original Nineteen Counties in New South Wales and is now one of the 141 cadastral divisions of New South Wales. It includes the area to the west of Sydney in the Blue Mountains, between the Colo River in the north, and the Coxs River in the south and west, encompassing Lithgow, Mount Victoria, Katoomba, Wentworth Falls, Lawson and most of the other towns in the Blue Mountains. The Nepean River is the border to the east. Before 1834, the area was part of the Westmoreland, Northumberland and Roxburgh counties.http://www.nla.gov.au/apps/cdview?pi=nla.map-nk5976-sd

Cook County was named in honour of the navigator James Cook (1728–1779). The Electoral district of Cook and Westmoreland was the first state electoral district for the area, between 1856 and 1859.

Parishes within this county A full list of parishes found within this county; their current LGA and mapping coordinates to the approximate centre of each location is as follows:

Parish LGA Coordinates Barton City of Lithgow Bilpin City of Hawkesbury Blackheath City of Blue Mountains Bowen City of Blue Mountains Burralow City of Hawkesbury Capertee City of Lithgow Clwydd City of Lithgow Colo City of Hawkesbury Cooba City of Blue Mountains Cook City of Lithgow Coomassie City of Blue Mountains Cox City of Lithgow Currency City of Hawkesbury Falnash City of Lithgow Gindantherie City of Lithgow Goollooinboin City of Lithgow Govett City of Lithgow Govett South City of Lithgow Grose City of Blue Mountains Hartley City of Lithgow Irvine City of Hawkesbury Jamison City of Blue Mountains Kanimbla City of Lithgow Kedumba City of Blue Mountains Kurrajong City of Hawkesbury Lett City of Lithgow Lidsdale City of Lithgow Linden City of Blue Mountains Magdala City of Blue Mountains Marrangaroo City of Lithgow Meehan City of Hawkesbury Megalong City of Blue Mountains Merroo City of Hawkesbury Mouin City of Blue Mountains Nepean City of Hawkesbury Rock Hill City of Lithgow Strathdon City of Penrith Warragamba City of Blue Mountains Wheeny City of Hawkesbury Wilberforce City of Hawkesbury Wolgan City of Lithgow Wollangambe City of Lithgow Wollangambe North City of Lithgow Wollemi City of Hawkesbury Woodford City of Blue Mountains

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