Where was Go West filmed?
1940 Marx Brothers film by Edward Buzzell
Go West (1940) was filmed in Tuolumne County, 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
Tuolumne County
United States
County in California, United States
“Some of the exterior railroad scenes were filmed on the Sierra Railroad in Tuolumne County, California.” Wikipedia