Where was Joe 90 filmed?
Television series
Joe 90 (1968–) was filmed in Slough Trading Estate, 1 place named in its Wikipedia article's Writing and filming section, in the United Kingdom. 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 Writing and filming section
Wikipedia’s Writing and filming section names 1 place. Each links to the sentence that says so.