I've never actually been asked if i'm an athiest... even in religious discussions. It's a little obvious with my FSM pictures on my desk among other things. I really don't think people want to know you doubt their beliefs. Even if they doubt themselves, they'll tend to say "I'm agnostic" rather than denounce the possibility of god completely. I don't remember meeting any actual athiests in person besides myself when i think about it. How about you?
Quite a few, locally there is a group that meets once a month. Plus a lot of my best buds actually think for themselves. Personally I do identify more as agnostic but I'm not hung up on terms. The fact is, we don't believe. Some of us are more open to possibilities but we simply can't believe at present.