Nordeck CD, Riehm KE, Smail EJ, et al. - A longitudinal, internet-based panel survey was designed to investigate changes in drinking behavior among US adults between March 10 and July 21, 2020, a critical period during the COVID-19 pandemic. Researchers conducted Understanding America Study, a nationally-representative panel of US adults aged 18 or older including a total of 4,298 US adults who reported alcohol use. Between March 11, 2020 and July 21, 2020, changes in number of reported drinking days in the overall sample and stratified by gender, age, race/ethnicity, household structure, poverty status, and Census region were measured. Adults in the US reported increases in the number of drinking days between March and mid-July 2020, with sustained increases observed among males, white participants, and older adults.