Where was Pony Express filmed?
1953 film by Jerry Hopper
Pony Express (1953) was filmed in Kanab, 1 place named in its Wikipedia article, in the United States. Wikidata itself records the shoot only as Utah. Each place says where its claim comes from.
Places per Wikipedia's article
The Wikipedia article names 1 place. Each links to the sentence that says so.
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Towns & cities
Kanab
United States
City and county seat of Kane County, Utah, United States
“Parts of the film were shot in Kanab Creek, Kanab movie fort, the Gap, and Johnson Canyon in Utah.” Wikipedia
Recorded only at country level
Also filmed in Utah, but the exact places are not known, so they are not on the map.
Filming locations that are mapped there: United States