Two of the "flags" are anonymous, though -- not sure if they count. But someone from Nigeria just stopped by (Hello, Nigeria!), so maybe we'll make it to a "real" 100 before long.
Speaking of flags, one of my kids recently participated in her school's Geography Bee. As a family, we learned a ton of geography facts when she was getting ready for the Bee. It was a great experience for all of us.
You can take GeoBee online quizzes (they change every day) at the National Geographic site.
The Armenian flag is from Maps of the World.