Where was Melvin Purvis: G-Man filmed?

1974 film directed by Dan Curtis

Melvin Purvis: G-Man (1974) was filmed in Nicolaus, Sloughhouse and Michigan Bar, 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.

See them on the map → Wikipedia Source data

Places per Wikipedia's Production section

Wikipedia’s Production section names 3 places. Each links to the sentence that says so.