Using the more common definition, the Colne Valley includes the towns and villages of Marsden, Slaithwaite, Linthwaite and Golcar.
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It was created by the merger of Golcar, Linthwaite, Marsden, Scammonden and Slaithwaite urban districts, and had a population of about 20,000 for its lifespan.
The Huddersfield Narrow Canal provided a heavily-locked Western connection to wool-weaving towns of the upper Colne valley (Golcar, Linthwaite, Slaithwaite, and Marsden) and across the Pennines to Saddleworth, Stalybridge and Manchester via Standedge Tunnel.