Though the exact number of residential education programs is difficult to determine because of the broad terminology used to describe the different programs , estimates are that there are upwards of 150 spread throughout the nation , with concentrations in the East and in the South .
Though the exact number of residential education programs is difficult to determine because of the broad terminology used to describe the different programs . 
 Estimates are that there are upwards of 150 spread throughout the nation , with concentrations in the East and in the South .