This article presents "American School & University's" 100 largest school districts in the U.S. The top 100 public school districts in the U.S. represent less than 1% of the more than 14,000 school districts, but in 2004-2005, they accounted for more than 20% of the nation's public school enrollment--10,795,068 students. The money spent by the 100 largest districts to educate children and build facilities is impressive, too. In the 2003-2004 school year, the 100 largest districts of 2004-2005 spent more than $106 billion--more than 26% of what all districts spent, according to the U.S. Census Bureau. At the end of fiscal 2004, the top 100 had outstanding longterm debt--the source of capital-improvement funds for most systems--of more than $62 billion, 24% of the total long-term debt for the nation's districts. From year to year, most of the districts on the list remain the same; enrollment shifts typically occur gradually, unless a district merges or breaks apart.