These are the states and U.S. territories that have mask-wearing requirements in place to help stem the spread of the coronavirus.
Association of State-Issued Mask Mandates and Allowing On-Premises Restaurant Dining with County-Level COVID-19 Case and Death Growth Rates — United States, March 1–December 31, 2020
Coronavirus Pandemic: Covid News: Three West Coast States Will Ease School Mask Mandates - The New York Times
Why wear face masks in public? Here's what the research shows
Why every state should have a mask mandate, in 4 charts - Vox
Frustrated Cities & States Turn to Vaccine Mandates to Fight COVID-19
Federalism 2021: COVID-19 Mandates The Rose Institute of State and Local Government
Oregon will lift mask mandate in early April for health care settings - OPB
Hochul on mask mandate: 'This is about getting us through a pandemic
Is It Time To Put On A Mask Again? > News > Yale Medicine
3 March 2021: Coronavirus Restrictions and Mask Mandates for All 50 States, United States — PublicHealthMaps