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Hey there John! Sam from Moz's Help Team here! The URLs that appear in Top Pages are there because we've found the most external links to them. Although the pages are no longer on your site, those links (using the previous and now redirected URLs) still appear on other sites. Top Pages is simply counting up the links we found to you, to show the most frequently used URLs. I hope this helps to clarify! You can always check the status code for a given URL by plugging it into a third party HTTP status checker like https://www.hurl.it/. Let me know if there's anything else I can help with!