School enrollment reports on persons actively enrolled in an educational institution at the time of the survey. On this page, the following grade levels are used: 
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Preschool: 
anything before kindergarten, typically anything between ages 2 and 4
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Kindergarten: 
the year before first grade, typically around age 5
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Grades 1-12: 
typically started at age 6 and lasting until age 17 or 18
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Undergraduate: 
in this context, it means and two or four year college, but excluding any graduate education
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Graduate School: 
anything above undergraduate, including pursuit of master's, professional, or doctorate degrees
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Public School: 
owned and operated by the government
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Private School: 
owned and operated by a private organization, often but not always with a religious affiliation
For additional information about the data presented on this site, including our sources, please see the About Page.