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Thanks!  We will probably test this solution.

Thanks, we have a few thousand parent pages that relate to these 500,000 URLs that have the parameters.  Is there a quick way to canonicalise thousands of pages at once?  It may not be scalable...

Hello,

So we recently used Google Webmaster Tools in an attempt to block certain parameters on our site from showing up in Google's index.  One of our site parameters is essentially for user location and accounts for over 500,000 URLs.  This parameter does not change page content in any way, and there is no need for Google to index it.  We edited the parameter in GWT to tell Google that it does not change site content and to not index it.  However, after two weeks, all of these URLs are still definitely getting indexed.  Why?  Maybe there's something we're missing here.  Perhaps there is another way to do this more effectively.  Has anyone else ran into this problem?

The path we used to implement this action:
Google Webmaster Tools > Crawl > URL Parameters

Thank you in advance for your help!