The annie e. casey foundation's kidscount online database is a great, user-friendly tool for finding child-related demographic data from the 2000 census. The site is broken up into three sections: profiles, rankings and raw data.

profiles: if you are looking for data about a specific district or set of districts, this section will work best for you

rankings: if you want to see how your district ranks among other districts in your area, state, or nation, this is a very useful tool

raw data: if you would like to download some of the actual data from the census, you can do it here