Estimates for the Olympics are:
Source: http://olympichostcity.vancouver.ca/cityhighlights/aboutvancouver/2010hostcity/frequentlyaskedquestions.htm
http://v2010isu.com says 7000 security personnel
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The most ever nations - 82 - will be competing in the 2010 Winter Games in Vancouver. In the last Winter games in Torino, 80 nations competed. Five nations will make their first ever appearance: Cayman Islands, Pakistan, Colombia, Montenegro and Ghana.
2,566 (1044 women, 1522 men) athletes competed from 82 nations at the 2010 Olympics.