Cowan covers an area of approximately 180 sq km from Banksia Grove in the north to Malaga in the south. The division covers parts of three Local Government areas - the City of Joondalup, the City of Wanneroo and the City of Swan.

It includes the suburbs of Alexander Heights, Ashby, Ballajura, Banksia Grove (part), Cullacabardee, Darch, Girrawheen, Gnangara, Greenwood, Hocking, Jandabup, Kingsley, Koondoola, Landsdale, Madeley, Malaga, Marangaroo, Mariginiup (part), Pearsall, Sinagra, Tapping, Wangara, Wanneroo, Warwick and Woodvale.