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A similar question was asked back in May and there were no useful answers. You can read what was said in this thread https://project-gc.com/qa/?qa=24184/cities-where-someone-has-found-caches&show=24192#a24192.
In my time on PGC, I have not encountered any tool that will help you to determine cities where you have found caches. I also checked the custom filters and the only option is Country, Region, or County.