Where was Holiday Inn filmed?
1942 film by Mark Sandrich
Holiday Inn (1942) was filmed in Sonoma County, Monte Rio and Russian River, 3 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 3 places. Each links to the sentence that says so.
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Towns & cities
Sonoma County
United States
County in California, United States
“Filming outside the studio occurred at the Village Inn Resort in Monte Rio on the Russian River, in Sonoma County, California.” Wikipedia
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Landscapes & nature
Russian River
United States
River in Sonoma and Mendocino counties in California, United States
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Towns & cities
Monte Rio
United States
Census-designated place in Sonoma County, California, United States
Places whose own article says it was shot there
1 place says on its own Wikipedia page that this film was shot there. Not on the map: the quote is linked so you can check it.
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Towns & cities
Monte Rio
United States
Census-designated place in Sonoma County, California, United States
“Portions of the 1942 Academy Award-winning film Holiday Inn were filmed at the Village Inn Resort in Monte Rio.” Wikipedia