Nobody is quite sure exactly how many American children are being taught at home. The National Center for Education Statistics, in a 2003 survey, put the number that year at 1.1 million. The Home School Legal Defense Association, which represents some 80,000 member families, says the figure now is quite a bit higher — between 1.7 and 2.1 million.
But there is no disagreement about the explosive growth of the movement — 29 percent from 1999 to 2003 according to the NCES study, or 7 to 15 percent a year according to HSLDA.
This growth has spawned an estimated $750 million a year market supplying parents with teaching aids and lesson plans to fit every religious and political philosophy. Home-schooled children regularly show up in the finals of national spelling competitions, generating publicity for the movement.