Where was Riding High filmed?
1950 film by Frank Capra
Riding High (1950) was filmed in San Bruno and Tanforan Racetrack, 2 places 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 2 places. Each links to the sentence that says so.
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Towns & cities
San Bruno
United States
City in San Mateo County, California, United States
“The film is a remake of Broadway Bill (1934), and some scenes for both Broadway Bill and Riding High were filmed at the Tanforan Racetrack in San Bruno, California.” Wikipedia
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Towns & cities
Tanforan Racetrack
United States
Horse racing facility in San Bruno, California