WOW! I think I know more homeschoolers than I do public schoolers : )
Since I am the director of our co-op, which has about 50 families in it's member base, I know more homeschoolers than most. Plus, we have moved 4 times since we have been homeschooling! So, that really increases the number of homeschoolers that we know.
Roughly, I would guess that we know over 100 families that homeschool : )
I set up a group of homeschoolers in town, and we get together for different activities. I can think of 7 or 8 families off the top of my head that are local. I do have friends out of the area that homeschool - probably another half dozen.