No statistics are publicly available. I have been researching this question all day.
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at last check it was estimated that 16 million people in America alone play the game, I am unaware of what the numbers are in the rest of the world.
Over 12 million people play paintball in the world, the numbers rise everyday (they already out number the people who play baseball!), and include over 100 countries!
Paintball is one of the fastest growing sports in America. It is the number 4 most popular extreme sport. It falls just behind inline skating.