The confederation of North, Central American and Caribbean Association Football, had hoped for four places up for grabs but will have to make do with 3.5 after FIFA secretary general Jerome Valcke said on Thursday the slots would be distributed in exactly the same way as in 2006 and 2010.
The only difference in the spread of the 32 finalists for 2014 World Cup could be a possible six representatives from South America as Brazil qualify automatically as hosts.
A "half place" means a berth in a two-leg play-off tie against a team from another confederation with the winners going to the World Cup.
"CONCACAF was not so happy, but they have to admit the huge majority of the executive committee wanted to maintain the distribution we have had since 2006," Blatter told reporters.
"Because CONCACAF was not so eager to play another play-off with South America, it was decided there shall be a draw for the playoff.
"It was a logical decision," he added. "One part is of this is always a sporting matter, one part is a sports politics matter, not everybody is happy but it is impossible to make everyone happy in our world."
FIFA announced that Canada - the only candidate after Zimbabwe pulled out - would host the women's World Cup in 2015 and the women's under-20 World Cup the year before.
FIFA, which controversially chose Qatar to host the 2022 World Cup, also continued the trend of taking the game to new venues when it awarded the 2012 women's under-20 World Cup to Uzbekistan.
