ATLANTIC CITY, N.J. — America's casinos are recovering from months of closures necessitated by the coronavirus outbreak, having regained 81% of the gambling revenue they saw in the third quarter of last year, the casinos' trade association said Monday.

But that recovery is threatened in places as the virus continues to surge throughout the country. Sunday night, Michigan's governor ordered numerous businesses including casinos to shut down for three weeks, and Atlantic City's top casino last week laid off or cut the hours of 422 workers in response to restrictions imposed by New Jersey's governor. 

Also on Sunday, Washington's governor also banned indoor service at restaurants and bars.

The American Gaming Association released a report on gambling revenue at the nation's casinos during the third quarter of this year — the time when most casinos reopened after four months or more of being shuttered during the first wave of the virus outbreak.

It found that the industry won over $9 billion in the third quarter of this year, which is 81% of the amount it won during the same period a year earlier, when there was no virus and casinos were operating normally. Virtually all casinos in the U.S. are operating with some restrictions on the amount of people they can accommodate and the type of operations they can conduct amid the pandemic.

The report found that nationwide gambling revenue is down 36.5% in the first nine months of 2020 compared to the same period in 2019. 

"Our industry continues to prioritize the health and safety of our employees, customers, and communities above all else," said Bill Miller, the association's president and CEO. "While these quarterly results are promising, the reality is a full recovery is dependent on continued public health measures to control prevalence rates" of the virus.

In a recent conference call to discuss third-quarter earnings, Bill Hornbuckle, president and CEO of MGM Resorts International, said the industry continues to deal with the pandemic, and has been forced to abide by restrictions.

But he also said September "was an exceptional booking month for the future. It's the best booking months we've had in seven. And so I think the tell is is that people are still booking into the future."

The report said more than 100 casinos reopened between July and September with 902 commercial and tribal casinos operational by the end of the third quarter.

Five states actually won more in the third quarter this year than they did in the same period last year: Arkansas, up 3%; Mississippi, up 2.8%; Ohio, up 7.5%; Pennsylvania, up 3.8%; and South Dakota, up 6.1%.

Revenue from slot machines was $5.87 billion for the quarter, down 19.3%, and table games revenue was $1.57 billion, down 31.2%.