The governors of Connecticut, Maryland, New York and Pennsylvania each issued orders or recommendations that residents wear face masks as they emerge from isolation in the coming weeks.
"If you are going to be in public and you cannot maintain social distancing, then have a mask, and put that mask on," said New York Governor Andrew Cuomo, a Democrat.
Similar orders were imposed in New Jersey and Los Angeles last week and face coverings were recommended by Kansas Governor Laura Kelly on Tuesday.
California Governor Gavin Newsom has said residents across the nation's most-populous state would likely be wearing masks in public for some time to come.
"We are going to be getting back to normal; it will be a new normal," Connecticut Governor Ned Lamont said, echoing a phrase used by at least two of his fellow governors in recent days.
US Midwest governors were also making plans together to restart their economies, said Jordan Abudayyeh, a spokeswoman for Illinois Governor J.B. Pritzker.
In Michigan, hundreds of cars flooded the streets around the state Capitol in Lansing on Wednesday to protest Democratic Governor Gretchen Whitmer's stay-at-home orders, some of the strictest in the country.
Some protesters, in the demonstration organized by conservative and pro-President Donald Trump groups, left their cars to gather on the lawn in front of the Capitol building, many of them not wearing masks or practicing social distancing.
TOLL ON HEALTHCARE STAFF
As of Wednesday night, 30,885 people in the United States had died of COVID-19, the respiratory illness caused by the novel coronavirus, according to a Reuters tally.
That total includes more than 4,000 deaths newly attributed to the disease in New York City after health officials revised their counting methods to include "probable," but unconfirmed, cases.
Healthcare workers have faced unique health threats while working on the front lines trying to tackle the pandemic. Reuters has identified more than 50 nurses, doctors and medical technicians who have died after being diagnosed with COVID-19 or showing symptoms of it. At least 16 were in New York state.
"The emergency room is like a war zone," said Raj Aya, whose wife, Madhvi Aya - a physician's assistant in Brooklyn - was one of the healthcare workers who died in New York.
As the outbreak begins to slow, political leaders have bickered over how and when to begin the process of unwinding unprecedented lockdowns that have badly damaged the economy and largely confined Americans to their homes.
Washington state Governor Jay Inslee told an afternoon news conference the largest obstacle to a return to normalcy was a shortage of coronavirus tests.
"We simply haven't had enough test kits – they simply do not exist anywhere in the United States right now," Inslee said, adding that the state had purchased about a million swabs, along with vials and test medium but they were just starting to arrive.
'ALMOST IN FREE FALL'
Trump, citing data suggesting that the peak of new infections had passed, said he would announce guidelines on Thursday for reopening the economy.
The sweeping closures of businesses have left millions of Americans unemployed and store owners struggling to pay rent.
Government data released on Wednesday showed that retail sales dropped by 8.7% in March, the biggest decline since tracking began in 1992. Consumer spending accounts for more than two-thirds of US economic activity.
In addition, output at US factories declined by the most since 1946 as the pandemic fractured supply chains.
"The economy is almost in free fall," said Sung Won Sohn, a business economics professor at Loyola Marymount University in Los Angeles.
The United States, with the world's third-largest population, has now suffered the greatest number of reported fatalities from the coronavirus, ahead of Italy and Spain.
The pathogen emerged last year in China.
Trump said on Wednesday his government was trying to determine whether the coronavirus emanated from a lab in Wuhan, China, and Secretary of State Mike Pompeo said Beijing "needs to come clean" on what they know. The official death toll released by the Chinese government stands at about 3,600.
The source of the virus remains a mystery. General Mark Milley, chairman of the Joint Chiefs of Staff, said on Tuesday that US intelligence indicated that the coronavirus likely occurred naturally, as opposed to being created in a laboratory in China, but there was no certainty either way.