Where was Alias Smith and Jones filmed?
American Western series
Alias Smith and Jones (1971–) was filmed in Castle Valley, 1 place named in its Wikipedia article's Production section, in the United States. 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 Production section
Wikipedia’s Production section names 1 place. Each links to the sentence that says so.
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Towns & cities
Castle Valley
United States
Town in Grand County, Utah, United States
“Parts of the television series were filmed at Castle Valley and Professor Valley in Utah.” Wikipedia