In this paper, we investigate how student enrollment in public schools is different after the COVID-19 pandemic. Over the pandemic--between the 2018-19 and 2021-22 school years--about 12 percent of public elementary schools and 9 percent of middle schools experienced more than a 20 percent decline. This is a significant change from before the pandemic, when about 5 percent of elementary and middle schools saw a 20 percent enrollment decline between 2015-16 and 2018-19. Enrollment declines are widespread but differ substantially across types of schools, locales, and socioeconomic status. The analysis finds that urban districts and high-poverty districts saw larger declines in school enrollment.