Basic facts about adult literacy are on NCL member organization ProLiteracy’s site.
Education attainment, such as the number of adults with high school diplomas, differs by age group and state.
A 2015 factsheet with findings from the High School Longitudinal Study reveal the characteristics of early high school dropouts.
NCSDAE wrote a 2012 factsheet on the adult education system.
A classic factsheet on adult literacy from 2009 cites NAAL data.
High school equivalency needs and testing volume in 2014 is the topic of an NAEPDC brief.