Where was Happy Valley filmed?
British drama television series
Happy Valley (2014–) was filmed in Huddersfield, Halifax, River Calder, Upper Calder Valley and HM Prison Ashwell, 5 places named in its Wikipedia article, in the United Kingdom. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.
Places per Wikipedia's article
The Wikipedia article names 5 places. Each links to the sentence that says so.
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Towns & cities
Halifax
England
Minster town in West Yorkshire, England, United Kingdom
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Towns & cities
Huddersfield
England
Town in the Metropolitan Borough of Kirklees, in West Yorkshire, England
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Landscapes & nature
Upper Calder Valley
United Kingdom
Valley in West Yorkshire, England
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Landscapes & nature
River Calder
England
River in West Yorkshire, England
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Landmarks & buildings
HM Prison Ashwell
England
Prison in Burley, Rutland, England, UK