Where was 20,000 Men a Year filmed?

1939 film by Alfred E. Green

20,000 Men a Year (1939) was filmed in Los Angeles, Grand Canyon, Zion National Park, Cedar City, Monrovia, Occidental College and 1 more place, 7 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.

See them on the map → Wikipedia Source data