These are the states and U.S. territories that have mask-wearing requirements in place to help stem the spread of the coronavirus.
Observed Face Mask Use at Six Universities — United States, September–November 2020
States Start Lifting Mask Mandates
A Detailed Map of Who Is Wearing Masks in the U.S. - The New York Times
Martin Paley on LinkedIn: The director of one of the largest ports
See Mask Mandates and Guidance, State by State - The New York Times
States drop COVID-19 mask mandates but still expect people to mask up – will they?
Why wear face masks in public? Here's what the research shows
Video States decide on differing mask mandates after CDC announcement - ABC News
Federalism 2021: COVID-19 Mandates The Rose Institute of State and Local Government
Covid-19 Mask Mandates Are Again at Center of Political Battles - WSJ
Trends in County-Level COVID-19 Incidence in Counties With and Without a Mask Mandate — Kansas, June 1–August 23, 2020
