Where was Princess Agents filmed?
Television series
Princess Agents (2017–) was filmed in Hengdian World Studios, 1 place named in its Wikipedia article, in China. 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 article
The Wikipedia article names 1 place. Each links to the sentence that says so.