how many children between ages 4 and 11 live in the usa and what is
the gender breakdown?

Hello colorwizard,
According to the 2000 Census, as of April 1, 2000, there are: 
16,833,336 boys and 16,031,641 girls in the United States between the
age of 4 and 11, inclusive.

See more detailed information here:
http://factfinder.census.gov/servlet/DTTable?ds_name=DEC_2000_SF1_U&geo_id=01000US&mt_name=DEC_2000_SF1_U_PCT012

Hope that answered your question.  If you need clarification, please
request it before rating this answer.
secret901-ga

Search strategy:
I visited http://www.census.gov and searched for age sex.

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Clarification of Answer by secret901-ga on 07 Sep 2002 12:32 PDT

Oops, so the total of children in the United States between the ages
of 4 and 11, inclusive is 32,864,977.

Thanks - I know I actually asked this question before but in less
detail...I was given the answer by secret901 then too! I was given the
link as well but when I tried to dig deeper myself I got lost... so I
just asked again and sure enough secret901 came back with the detailed
breakdown answer- time is money and it was worth it!