What for? It really wouldn't help you, since with open registration and a policy to NOT delete spammers, the numbers are way off.
However from a remark Otto made in September:
Data as of about 5 minutes ago (note, numbers are raw and include
things like spam and deleted topics, etc):
Total registered users: 2,734,563
Active users in support forums (have ever made a post): 314,960
Note that many people register and then never post anything. Never
been sure why they do this. There are legit reasons, like logging onto
the codex, or plugin/theme uploads, but 2.7 million is still a lot.
We're over 3,000,000 users now I think.