Twelve studies find that overall gains in charter schools are larger than other public schools; four find charter schools’ gains higher in certain significant categories of schools; six find comparable gains; and, four find that charter schools’ overall gains lagged behind traditional schools.
Source: Charter School Achievement: What We Know, July 2005 Update
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Download: 
http://www.publiccharters.org/files/2182_file_2007_Charter_Numbers_1_.doc
This document offers the most reliable and up-to-date state-by-state numbers on charter schools and students. As of April 2007, 1,144,758 of the nation's children are being educated in 4,046 charter schools. The number of schools ranges from just 1 in Mississippi to 621 charter schools in California. California also has the largest number of charter students (approximately 220,000). Michigan, Ohio, Florida, Texas, and Arizona also continue to have large charter markets.
Date: 2007
Source: National Alliance for Public Charter Schools
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