How many four year olds are there currently in the City of Chicago? 
Please cite reputable source or how you came to your figure.  Please
no "creative guessing" or interesting math.  Needs to be clear and
basic from a reliable source.

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Request for Question Clarification by justaskscott-ga on 20 Nov 2003 15:39 PST

I have found a government estimate for chidren under 5 years old in
Chicago in 2002.  In my view, it is a reasonable presumption that the
number is fairly evenly divided between children 0-1, 1-2, 2-3, 3-4,
and 4-5 years old, and that the number did not change greatly from
2002 to 2003.  Thus, one can divide this figure by 5 to get a good
estimate of the number of 4 year olds currently in Chicago.

Would this be a sufficient answer?

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Request for Question Clarification by justaskscott-ga on 20 Nov 2003 15:46 PST

Please note that the number of children under 5 in Chicago listed by
this same government agency was only 5,000 less in 2000 than in 2002;
in other words, it differed by only a small percentage of the total. 
So it does indeed seem reasonable to assume that the number will be
approximately the same in 2003.