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Blackburn is administered by Blackburn with Darwen unitary authority, which encompasses Blackburn and the small town of Darwen to the south.
The Borough of Blackburn was formed by the amalgamation of the County Borough of Blackburn, the Borough of Darwen, part of the Turton Urban District and the parishes of Yate and Pickup Bank, Eccleshill, Livesey, Pleasington and Tockholes from the Blackburn Rural District.