These Web Tables use nationally representative data from the National Postsecondary Student Aid Study (NPSAS) to provide descriptive statistics regarding nontraditional characteristics in the U.S. undergraduate population. Using the most recent data available, the statistics presented in the tables update and augment previous NCES reports that focused on the topic (Choy 2002; Horn 1996). To examine trends over time, table 1 shows the distribution of undergraduates by number of nontraditional characteristics possessed and specific nontraditional characteristics during the 1995-96, 1999-2000, 2003-04, 2007-08, and 2011-12 academic years. The remaining Web Tables use the most recent NPSAS data, collected in 2011-12. Tables 2-8 present the individual characteristics used to define nontraditional students, by demographic and enrollment characteristics. Tables 9-17 document various characteristics related to undergraduates' academic preparation and postsecondary number of nontraditional characteristics and specific nontraditional characteristics undergraduates held. Table 9 examines high school grade point average (GPA) and high school mathematics coursetaking among undergraduates under age 30. Tables 10 and 11 show previous postsecondary degrees or certificates earned and the types of postsecondary institutions ever attended. The final tables exhibit 2011-12 postsecondary enrollment characteristics: type of institution attended (table 12), participation in online courses and online degree programs (table 13), type of degree program pursued (table 14), reasons for taking courses if not in a degree or certificate program (table 15), field of study for students enrolled in a certificate or associate's degree program (table 16), and field of study for students enrolled in a bachelor's degree program (table 17).