Due to the COVID-19 pandemic, the number of airline travelers worldwide has plunged. American Express announced that, starting March 21, it will temporarily close all Centurion Lounges worldwide, including 11 in the United States and one in Hong Kong. There is no set reopening date yet; reopening is expected to depend on the pandemic easing and traveler volume recovering. AmEx said it will announce reopening dates in advance through the AMEX app.
Reference: https://thecenturionlounge.com/
TPG has also summarized which airline lounges across the U.S. have been closed due to the pandemic. If you’re interested, you can click here for reference.