The World Organisation of Scout Movements has 150 member organisations. Scouting is now in all but five countries in the world: China, Cuba, Manymar (formerly Burma), North Korea and Turkmenistan do not have any Scout movements.. A full up to date list of member Movements can be found on the WOSM web page.
All in all it is believed that the total membership over the last ninety years of Scouting (and Guiding) is somewhere in the region of half-a-billion, and that its effects have touched many more.