"I know of transgendered people, but I don't know them personally" was meant to cover acquaintances who are not really friends. It probably could have been worded better, but alas, I am not perfect.
The answer "I don't know any transgendered people" surely includes the fact that some people don't realize that there are transgendered people in their lives. That could very well be why some people have chosen that answer. I'm not sure how you purpose to ask "are there transgendered people around you that you've failed to notice"
This poll, as I stated in the original question, was to find out whether people here on EF know transgendered people, and what, if any, level of relationship they may have with same. My intention was to allow transgendered people and those who care for them to see that they are not alone. It was not meant to ask familiarity with KNOWLEDGE of the transgendered community. Maybe someone should start a poll or discussion about that.
I'm extremely pleased with the overall tone in the responses to this poll. It seems there have been opportunities for people to share experiences and knowledge that others seem to appreciate. I hope that more contributors share their knowledge and experiences so that others, including non-contributors, can possibly find at least a little bit of acceptance.