On June 3, 2020, this report was posted online as an MMWR Early Release.Kathleen P. Hartnett, PhD1,2; Aaron Kite-Powell, MS1,2; Jourdan DeVies, MS1,2; Michael A.
Coletta, MPH1,2; Tegan K. Boehmer, PhD1,3; Jennifer Adjemian, PhD1,2; Adi V. Gundlapalli, MD, PhD1,4; National Syndromic Surveillance Program Community of Practice (View author affiliations)The National Syndromic Surveillance Program (NSSP) collects electronic health data in real time.NSSP found that emergency department (ED) visits declined 42% during the early COVID-19 pandemic, from a mean of 2.1 million per week (March 31–April 27, 2019) to 1.2 million (March 29–April 25, 2020), with the steepest decreases in persons aged ≤14 years, females, and the Northeast.