As far as we know right now, there's ten. Only four of us were alive when I came here. But we just discovered number ten right before I got here, so who knows. There could be a hundred of us. Right now, there's me, Sarah, Alison - we're the "good" clones. In the way that we've very recently discovered each other. And then there's Rachel who apparently is what Felix calls a proclone. She grew up knowing what she was, embracing her next step in evolution.