Where was The File on Thelma Jordon filmed?
1950 film by Robert Siodmak
The File on Thelma Jordon (1950) was filmed in Santa Ana and Old Orange County Courthouse, 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
Santa Ana
United States
County seat and city of Orange County, California, United States
“Location filming was performed at the Old Orange County Courthouse in Santa Ana, California and at the Los Angeles County jail.” Wikipedia
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Landmarks & buildings
Old Orange County Courthouse
United States
Courthouse in Orange County, California, United States