Hard to answer definitively, but this would be a good place to start:

http://www.cacherstats.com/Arizona1.html

On Sep 5, 2009, at 12:01 PM, Jason Poulter <jason@azgeocaching.com>  
wrote:

> Can someone help answer his question, reply to the address below.
>
> Thanks
>
> Jason
> Azgeocaching
>
> This is an enquiry e-mail via http://www.azgeocaching.com/ from:
> bishoptakesqueen <garykemp@sbcglobal.net>
>
> How many geocachers in AZ and how many caches do each have??
>
>
>
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