Borough of Onslow

The Borough of Onslow was a local government district immediately to the north of Wellington, New Zealand.

Incorporated on 13 March 1890 it included the districts of: Wadestown, Crofton, Khandallah and Kaiwarra but not Johnsonville.

Hutt County had imposed a tax on all traffic entering Wellington and their toll gate was on part of the proposed new borough's district.

The difficulties of building adequate drainage for Wadestown within Onslow's boundaries, the subdivision of the Highland Park estate and the appeal to the residents of this very steep area of joining Wellington's tramway system led to Wadestown's amalgamation with Wellington City in April 1907.

[7] The rest of Onslow Borough, at their persistent request, was amalgamated with Wellington City on 1 April 1919.