Why do you ask?
At the bottom of the main site it shows "Members: 224,552", but that's not really true

.
If you take a look at the member list (which is everyone who has posted 3 or more times), you'll see that there are 57820 listed...but that's over more than 10 years.
If I normally go online, I can see in the overview (currently deactivated) that in most cases ~200 members and ~800 not registered visitors are online. So I'm sure that there are daily more than 1000 registered people here.
Does this answer your question

?