Where was Halloween III: Season of the Witch filmed?
1982 film directed by Tommy Lee Wallace
Halloween III: Season of the Witch (1982) was filmed in Humboldt County and Loleta, 2 places named in its Wikipedia article, in the United States. Wikidata itself records the shoot only as California. Each place says where its claim comes from.
Part of the Halloween film series
Places per Wikipedia's article
The Wikipedia article names 2 places. Each links to the sentence that says so.
Recorded only at country level
Also filmed in California, but the exact places are not known, so they are not on the map.
Filming locations that are mapped there: United States